need a second opinion! help!!

m

okay, so my boyfriend and i had unprotected sex..ish he was inside me no longer than 20 seconds total but the night before he had came because we were sexually active then too..

so what are the chances of the precum having living sperm in it from the night before? he did pee in between a good four times since it was a whole day separation between sexually activeness..

im about about two weeks late for my period but i havent had any preg symptoms and no implantation bleeding.. only my discharge has been off.. like 3 days ago it was super clear and sticky and today its super white and thick..

i havent taken a test yet because my period is almost always irregular varying from 2 months late to 2 weeks early... is there a high chance im pregnant? this is the only encounter of unprotected sex

UPDATE: i took a test and it came out negative. still no period and weird white thick discharge. should i still be worried? should i take another test in a couple days?