Community post

We know the it takes 6-12 days to implant after ovulation, and that ovulation is a 2-3 day window, and add in that you ovulate 12-14 days after the start of your period and see if that matches up with the timing of the intercourse. If it does, you'll know the first day of what would have been your last period and estimate using that date. (Hopefully that makes sense)
Have you taken a hpt? There's always that too, and that will be the only real way to know.
Good luck!

If you are pregnant the dr can organise a scan which will confirm your due date. A lot of ladies who have irregular cycles etc have dating scans.