Old belly piercing holes infected during pregnancy

Has any other ladies experienced this, I had my belly button pierced 4 times when I was younger and then only had one in when I fell pregnant. The other 3 that I haven’t had anything in For years and thought were healed keep having puss type stuff come out the holes. I was wondering if this is just because of my skin stretching? They aren’t sore just a bit red and itchy. I’m 39 weeks pregnant and it started about 4 weeks ago.