I've been having a lot of sex and I am still not pregnant.

I've only been trying in March we had sex mostly everyday around that time and I am not pregnant April I didn't have my period I ovulated late so our timing was off and I had my period May 20th. June and July negative after negative. Last month July 12 had a light period but already tested for pregnancy around August 5th (blood test) negative again. This month tested negative today but I could be testing to early because my period isn't due until next week or hopefully it won't be late. I'm just trying to relax and just let it happen I don't want too chart my bbt using opks and all that extra stuff I know it helps but I'm just going to keep trying too hard all I'm doing is just eating healthy taking prenatals and just enjoying sex with my partner. I just wonder if it's possible not to get pregnant when a guy has came in you soo many times just wondering. Fingers crossed hopefully this month is my month hopping for the best.