Is there still a chance I could be pregnant?

Hi yall!!

I am totally new at tracking. We are both 22 and we have been TTC for over a year and a half. I talked to my obgyn and she said keep trying because my periods are regular and everything looks good.

I was suppose to get my period on the 27th of June, it never came. I have been taking tests every two days and they are all negative. How long before the hormone typically shows up? I see a lot of you lovely ladies getting postivie test results back before your period is due. Can I still be pregnant and I just don't have enough hormone to show up?

I'm just really confused. Thanks yall! 💜