Community post

Sperm can live up to 5 days in the right conditions (hospitable cervical mucus) but if you had a positive OPK on the 18th you probably didn't ovulate for another 12-24 hrs. There is a chance that sex on the 14th could cause pregnancy but the chances are slim. Also- you really wouldn't be feeling anything yet because if you just ovulated- you also just released your egg and fertilization may not have even occured yet. You usually don't experience any pregnancy related symptoms until after implantation which is normally not until 7-10 days after ovulation/fertilization.
Hang in there. If you're serious about TTC think about tracking your cycle Fertilityfriend.com is a great resource and it will tell you when you should have intercourse. Otherwise- try to have sex closer to the date of expected ovulation. You can probably expect to be TTC for a few more months as it's normal to take up to a year to conceive. Good Luck!

Also- you probably shouldn't expect an accurate answer on a HPT until May 31st - June 2nd. Taking them at 8 days after ovulation or less is just a waste of money. There isn't enough hormone in your system (normally) to show up on a test until 9 days and then it's very low. First positives usually don't show up until 11-12 days past ovulation (dpo).