Really? Honestly it could be either/or. Precum also contains sperm. Good luck with that.
When did you get the positive pregnancy test?
The short answer is, no matter what you figure out from dates, you definitely will need a DNA test once the baby is born. This should be the first thing you plan on.
Just going from the first day of your last period, you would have ovulated around December 3. Unfortunately, judging from the first day of the prior period is not that useful, especially if your cycles are not super regular to the day. And of course, even if you knew for sure you ovulate December 3, you could not assure yourself that the ex was ruled out, since sperm can last 5 days in your system. (Despite his not ejaculating, you can't guarantee he didn't have some sperm come down in his pre-ejaculatory fluid.) Anyway, overall, your chances of the baby being your boyfriend's are a whole lot greater, but there is still a slim chance the baby is your ex's.
To try to narrow this down a bit, see if you can get an ultrasound in the week of December 30 or January 6. Be sure to ask at that ultrasound for your estimated due date (EDD). Once you have that, you can put it into a conception calculator or just manually count back 266 days to the presumed date of conception. If, once you do the calculations, ovulation does come out to be at around December 3 for conception, that isn't going to eliminate either candidate, but if it comes out at, say, December 7 or later (or, unusually, November 26 or earlier) that will help you rule out the ex.
thank you that really helps
Im in a similar situation..im 5 weeks...does that put conception around the 28th of nov
Curious to know how this turned out... who ended up being the dad?