Hi, could you say when you found out you are pregnant and when your last period was?
Kriznamean, tell the doctor you are wanting to have the ultrasound (not the date of your last period) be what informs you of your estimated due date. Say you need an estimated due date that is based only on the size of the embryo and its developmental markers, not based on the date of your last period. (Tell the doctors that your cycles are irregular, so you can be sure he does not use the first day of your last period to tell you how far along you are. The first day of your last period is sometimes helpful but sometimes not, and you want as much accuracy as possible.)
Once you get an estimated due date that comes from the size of the embryo in the ultrasound, you can either count back from it 266 days on a calendar, or you can put it into an online conception calculator, and it will give you an estimated conception date. But you need that due date to be based on the information from the ultrasound.
If a doctor tells you a certain number of weeks pregnant, ask if he is talking about how long since conception. Usually he will not be talking about counting forward from conception. Doctors saying "gestational age" or "weeks pregnant" are counting from the first day of bleeding of the last period you had, two weeks or more before getting pregnant. If the supposed dad is in the room and the doctor throws around terms like "6 weeks pregnant," stop the doctor right there and say, "do you mean 6 weeks since conception?" and be sure to use the word "conception." (Not how "far along" am I?) You need to be sure the doctor and yourself are speaking the same language. Doctors are used to naming a number of weeks that begins two weeks before you got pregnant, and forget that it sounds to their patients like the weeks begin on the day of conception.
More likely to be your boyfriend. How many days is it from the first day of one of your periods to the first day of the next period? Is it usually about the same number of days, such as, 28 or 29 or 30?
And is it regularly 33 days or does it vary?
I was asking how regular your cycles are (or if they are not regular). This means are they exactly 33 days every single month, for a year, or two years or since you have been having periods? Or are they sometimes 33, sometimes 30, and sometimes something else? A specific answer to your question about who is most likely the dad will come from your ultrasound, but since you haven't had an ultrasound yet and are still pushing for an answer, the only clue available is how regular your cycles are.
If your cycles are NOT regular, you cannot know when you might have ovulated just by looking at a calendar, and all you can do is wait until you talk to the doctor after the ultrasound. If they are regular, it might suggest a clue.
Yes 33 cycle and regular like clockwork? You can look at a calendar and mark every 33 days for a year and know that is EXACTLY when your period will come? Or just lately they have been around 33? I wish you would answer this question, it is important. I get that you are saying 33 days, what I am asking is if the cycles are totally regular such that you can count on them being every 33 days forever?
Did you have the ultrasound? And if so, did the doctor give you an estimated due date?