Pregnant or not?

A👩🏻‍⚕️ • •Wife•Future RN•TTC #1•

I was due for my period the 29-1 but didn’t experience any heavy flow like I always do. 3 days before my expected period I had very dark spotting(like after a period) but haven’t commenced my period. My husband and i did have sex 5-7 times during our fertile window and on ovulation day. Could it be implantation bleeding? I took a pregnancy test twice and both come out negative. Please help!