What is this??

so I’ve been on the combo pill since December 22nd and I haven’t had sex. 3 times this month I’ve done sexual things like fingering, oral/69 with my bf. Right afterwards I always wash my hands with soap and water to make sure sperm and semen are off. But I always have a habit of touching my vagina after washing my hands to check my cm. Each time I know my hands are dry but I still get paranoid, my anxiety kills me thinking that could get me pregnant or if by some chance he has sperm or pre cum on his fingers while he fingered me. But I found this in my pants today. My period is supposed to come in 5 days, what is this?!!