Uy, I totally understand your worry kasi first time mom ka pa lang, pero seryoso talaga ito, please check with your OB agad, kahit worried ka lang, mas better safe than sorry lalo na sa third trimester. A few of us moms in my circle experienced the same thing and nakita ng doctor namin na okay lang, pero may iba pang beses may underlying issue kaya really kailangan ng professional check, hindi lang sa online reassurance.