HEEEELP

So I started what I thought was my period yesterday but every time I put a tampon in/ take it out it hurt like hell and there was nothing on it! (Except for a little bit) my periods are normally really heavy, so I’m confused at this point and last night after using the bathroom I wiped and this is all that I see... my period was six days late. I’m starting to think that it’s not even a period. I’m also sexually active...