Can I switch to a bioflex ring while my piercing is unhappy?

Hello,

I have a belly ring. I'm not sure what happened - maybe new jewelry, or what, but the site has become red and irritated. I found a belly ring and I didn't sterilize it before I put it in, so that was possibly the problem. I also don't know what the medal is, but I've never had a problem with any particular medal before.

I'm 17 weeks pregnant so I know that I will have to switch to a bioflex ring at some point. Should I just switch now? Or does it need to be completely healed before I use plastic?