What is it?

Hey gals - sorry if I’m this is tmi - I’ve had this before but thought I’d see if any of you lovely ladies could really tel me what it is. Tonight in my underwear I had what I can only describe in texture, consistency, color, etc. as a big clump of rubber cement! Is it just dried fertile cm? Leftover semen? From ovulation since it had some very slight pink-brown tinge - but I’m not supposed to ovulate for another couple days or... ? Input appreciated! TIA!