What is this!?!

Abbey

So this is a little tmi but I need help and am super confused. I’m sexual active with my partner and ever since I lost my virginity 3 years ago (if it’s after sex or just any other day) I get this sticker white, clear stuff. When it comes out peeing or just before I go to the bathroom and look down at my underwear it’s there as well....? I have to constantly change my underwear because of it during the day. It’s not my partners cum because he always pulls out or we use a condom. (Also on birth control) I’m not in any other pain or weird symptoms but I just want to know what this is!!!? Someone help me 😅