Period or implantation

I had unprotected sex June 28 & June 30 and both times, my partner came in me. The app said my period was dude on Sunday 7th but it didn’t show so I’m wondering if this is my cycle (I usually start with heavy dark bleeding) and there was only a drop in my underwear and this is what it looks like when I wipe.. dull aching pain for the last few days