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Who is my baby daddy?
Hello. So I saw my period on the 7-12th of September 2017.  I had sex with my someone on the  19th and 20th while fertile he ejaculated fully in  me and I ovulated on the 22nd wasn't feeling too good did a test 24th it was  negative. Probably too early ...I Had sex again with my new bf Oct 2nd, 13 days after and my last ovulation and about 3 days to my next period ,he however withdrew and didn't come inside me, and I by my calculations I wasn't ovulating ..Now my Period is late Went for routine checks on the 10th of October and did blood work and am  pregnant. Who is most likely to be the father ..am thinking I took in September...pls help
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134578 tn?1483549754
If your cycles are super regular, such as, every 28 days your period comes like clockwork, the guy with whom you had sex on the 19th and 20th is a better bet for dad than the guy with whom you had sex on October 2. If your cycles are irregular, though, all bets are off. A woman can ovulate whenever, and wait a long time between periods to ovulate again.

You say "while fertile" and "I ovulated on the 22nd" and "13 days after my last ovulation," like you know for scientific fact when you did ovulate. The only way someone can know for totally sure when she ovulated is if she went to the doctor and had an ultrasound, and they saw the egg in the follicle, and then the next day she went back and had another ultrasound, and they saw that the same follicle was empty. The second-best way to know would be if she was testing for the hormone rise that comes before ovulation, using ovulation test strips. The third best way would be if she was doing a temp chart. (I guess another way is if she has the pain with ovulation known as mittelshcmerz.)  Is any of those the way you know for sure when you ovulated? If not, how do you know when you ovulated, are your cycles so never-fail exactly every 28 days that you can be certain you ovulated 14 days before your next period was due? At this point, any guess of what date you got pregnant are only as good (or bad) as the assumptions on which you based your estimate of when you ovulated.

If you ovulated when you think you did, the guy with whom you had sex on the 19th and 20th would be right in the time frame to have covered the date of ovulation. Your egg would only last 24-36 hours if not fertilized, making the second guy too late.

Again, as I said, this all depends on how accurate your assessment is of when you ovulated.

A more scientific way to know, but you have to have a doctor willing to do an ultrasound, is, when you get to between 6 and 7 weeks from the first day of your last period, get an ultrasound. (Don't do it much later or it won't be useful enough for your purposes.) Tell the doctor either that you don't remember when your last period was or that your cycles are so irregular that you don't want the first day of your last period put into the computation when determining the baby's due date, say that you just want them to use the baby's crown-to-rump measurement and developmental markers to tell you when the baby is due. Then take that due date home, and put it into a conception calculator online or just count back from it 266 days, and that will give you an estimated conception date. An estimated due date based on the embryo's size in the 6th or 7th week (counted from the first day of the woman's last period) is accurate enough to be able to point to the probable father if the two guys were two weeks apart. A later ultrasound won't give that kind of accuracy, since all babies begin as one cell but after a while some grow faster and some grow slower. If this question is going to bug you for your whole pregnancy, it is well worth paying out of pocket for the ultrasound if the doc won't do one so early.

If you get past that time point and still need to know, if you want to pony up the really big bucks, you can get a prenatal DNA test from Ravgen or the DDC. They are about ten times the cost of doing a DNA test after the baby is born, but if you test with both guys and use one of those two labs (no Internet cheapie so-called "labs" please) you will know for sure well before the baby comes.
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Thank you...I based my ovulation calculation based on my cycle...I ll however opt for the 6-7 weeks untrasound later this MONTH. Thanks again for your reply..
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134578 tn?1483549754
It's never a great idea to count forward from your last period to try to figure out when you ovulated, unless your periods come literally every 28 days without fail every single month for years on end.

If your months vary at all, that means your ovulation date is varying. Ovulation is the starting action and the period is the ending action, not the other way around. A woman ovulates, and about 14 or 15 days later, her period comes to clean out the unneeded  lining (if she didn't get pregnant in the meantime).

Then the body goes on its merry way, and when it feels ready and healthy and not stressed, it ovulates, and then 14 or 15 days later, if the woman hasn't gotten pregnant in the meantime, her period comes.

In short, you can't reliably count forward from a prior period to see when ovulation was. The period is merely the ending result from the previous ovulation and does not trigger the next ovulation. Women can go long or short times between the end of the last period and their next ovulation.  

Get the ultrasound sometime between the 20th and the 26th given what you have to go on so far. Be sure to get an estimated due date, don't just let them tell you a "weeks pregnant" count and send you away, since "weeks of pregnancy" counts begin on the (assumed or calculated) first day of the last period, not on the assumed date of conception. (And they are based on the assumption of a woman having a 28-day cycle, when many women do not.) Do all your calculations using the due date created by the doctor reading real measurements of the real embryo.

Also, any time you talk to the doctor about when you might have conceived, use that actual word. Don't use euphemisms like "How 'far along' am I?" Because the doctor will answer with a GA, that begins on the first day of your last period, if you are not clear in your question.

Good luck, and write back.
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