Pica, but not pica...

Regs

So basically I want to chew on sponges. I know it's weird, and I know its something to do with my pregnancy, but someone was trying to tell me it was Pica. Now in my limited knowledge of things I'm pretty sure pica is when you eat something weird, like swallowing it and everything. I dont want to do that. I just wanna chew a sponge.

Anyone else experienced something like this or even had pica?