Contractions? 39 weeks, FTM

Sabrina • 24 and have a handsome baby boy that was born on 10/16/2016!
For the last few days I've been having a shooting pain in my lower pelvis, like right at the bottom of my stomach. It's pretty painful when it comes but doesn't last long, maybe 15 seconds for the longest ones. Usually happens when I'm sitting down and they're not frequent. Is this what contractions feel like? I always thought I would for sure know but now I have no idea. I've also already lost my mucus plug/bloody show. So just basically wanna know if your contractions felt like this? Thanks!

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