Could it happen?

I just wanna ask something. The 5th of July I did some naked grinding with my bf (no ejaculation anywhere near, no precum-for as much as I remember, and no penetration - still a virgin). It happened 1 week before my period was due, it came right on time as my usual cycle ( 30 days ) but reading a lot of things lately made me worried of it being implantation bleeding even tho’ it lasted 5 days and it had some small clots, normal heavy, red color

& period smell ( sorry for tmi), now it’s been 13 days since the start of my period, I took 3 pregnancy tests since last week and all came negative, but Idk reading a lot of stuff has got me anxious&worried;, what do u think, could I be pregnant?