When my step mom had her c section they made her take it out and she left it out for a few weeks and it went right back in, it was pierced for a year maybe a little more.
Anyway u can get a plastic one put in like some do with belly button piercings?
I had mine pierced as well before my first...they told me to take it out when I was in my third trimester. Unfortunately I was unable to put it back in. It was closed for good by the time I was healed after birth.
U might wanna take it out. Because being pregnant your more prone to get infections so u wouldn't wanna Get one down there in my opinion. Hopefully this helps u make a decision
I would guess it would start to close up fairly quick, but you could always ask someone who does piercings.