Spotting or Period???!?!?!?

I’ve been having unprotected sex since March 16th, which was the last day of my period and second day of me being fertile according to my app. I supposably got my period on March 30th, i haven’t been heavy at all, my tampons(TMI) only have had a little bit of blood. I don’t know if this means I’m pregnant or not. I’ve taken pregnancy test but they come out negative, most likely because its too soon to know.