So im 23 and my girlfriend is 28. We have been trying to concieve for a month now. We had sex 16 times last month during her fertile period and shes supposed to have her period tomorrow and she took a digital pregnancy test and it was negative.she took a cheaper one this morning also negative. She has regular periods but she got off birth control 3 months ago so we could start to conceive. I would think something is wrong with me but theres no reason why i would be infertile. When i was 18, me and my ex had alot of unprotected sex but she never got pregnant.I had my thyroid checked and it was normal. Could it be me or her?