When i was preg with my 1st i was so sure i was about to have my period, and so were alot of my friends when they were early on too.. We all had period pains in the begining, when i had a positive i spent the next 2 weeks thinking it was wrong, as i felt just as i did b4 my period. Also you can get a small bleed a few days b4 ur period when ur fertilised ovum emplants. So u could b pregnant!
But if ur not, u need to have sex about 1-2 days b4 u expect to ovulate, as sperm survive for up to 72 hours, where as ur ovum has only really 12 hours to meet sperm, so this way, the sperm are ready and waiting for it!!! Why not try one of those home ovulation tests?? Good luck!!!