Advise please?!? (TMI)

Samantha
So i am in need of some advice as to what i should do. My husband and i have been TTC for 1 yr. My last AF was 04/13/17. I am usually regular every 28 days and lasts 5 days. Well on saturday 05/06/17 i started to get bad cramps. husband and i had intercourse. And then 05/07/17 i started to bleed. It was light then heavy stopped and then came back.. I passed blood clots.. And now the bleeding had stopped after only 3 days. Took a pregnancy test tuesday on the 9th and it came back neg. Im so confused as to what is going on or what to do.. Any advise will help! Thank you!