I feel like there is a tiny line on the inverted one but i can only see it with my brightness all the way up

I could just be psyching myself out. But I’m 3-4 weeks after being fingered with potential precum on his hand. DID NOT HAVE ACTUAL SEX. I bleed for 6 days on the day my period was supposed to start. 4 days were heavy/ medium and the other 2 were light and spotting. I had bad cramps the first day which is normal for me.