Write back when you get an estimated due date from your ultrasound. From that estimated due date, you can use an online calculator or just count back on a calendar 266 days, to get to an estimated conception date.
I think you should get an ultrasound this week. Tell the doc you don't know when your last period was, or say your cycles are really irregular, so he or she won't use the first day of last period to tell you when your due date is. You want a due date given to you by the measurements of the embryo as seen on the ultrasound only, not one computed from your last period. Possibly it will point out a date that suggests the second guy is too early or too late to be the dad.
My due date is the 20 of March 2017
Even tho the second guy pulled out? I'm just hoping it's the first guy cause we are still together and this could be his first child
Have you had an ultrasound yet? It might not help if your tracker was accurate, but it's your only hope for a clue at this point. Trackers are only accurate if your periods are always exactly a certain number of days apart, such as every 28 days on the dot. They can't accurately predict ovulation if your cycles vary. An ultrasound (done within 8 weeks of the first day of your last period) might shed some light on it, but if you only had two days between the guys *and* if you happened to have ovulated when your tracker says, it won't help because both guys would have had live sperm in your system on the 28th.
I was using a calendar that was tracking my period and ovulation day
Hi, how do you know the 28th was your ovulation day? Were you using ovulation test strips or being monitored by a doctor?