TMI Clear stretchy discharge after sex??

Last night me and my boyfriend drank and ended up having unprotected sex around like 4 am..... I peed after and cleaned myself off. When I woke up the following morning (a couple hours later) I went to use the bathroom and seen I had this long stretchy clear discharge. Not sure if it could possibly be his semen leaking out? Or maybe a mixture of that plus my own discharge clearing out?? Has this happened to anyone?