He came in me, I'm on nexplanon

So I've been on nexplanon for a month already and I had sex yesterday and the day before ,both days my boyfriend came inside me(which btw feels amazing) this is the first time he's ever done that. Just to be safe yesterday I did take plan b, but today I have super clear and sticky discharge coming out of me continuously and I was wondering what it could be? Please help, no rude comments.