infected piercing site?

I've had my belly button pierced since I was  16, I haven't worn an actual piercing since I got pregnant wth my first back in 2013
Today it was bothering me a little bit & I noticed some redness & a bit of swelling around it.. I was getting ready to shower and decided to squeeze it to see if any pus would come out & there was pus coming out of it.. I'm debating whether to just put an antibiotic cream on it or to call my OB & see what they want me to do? 
I'm 31 weeks pregnant btw