Panicked probably for no reason, right?

So I have the IUD and I had sex with my boyfriend for the first time, it had been my first time having sex in a very long time due to a tramaric event with sex. I've been pregnant before.miss carried.. 
We had sex with no condom (stupid I know), but he pulled out, he definitely wasn't anywhere close to ejaculating. 
Took a pregnancy test about 3 weeks after and tested negative
I had thick clear discharge today and my nipples hurt a little ( which may have been from him sucking on them yesterday...).. I'm freaking out. It's probably my anxiety, but does it sound like I should worry ??