Mama, I know na nakaka-alala yun, please call your OB or go to your clinic/hospital right away para ma-check ang muscle tightening mo, ha? That needs to be looked at immediately, especially this close to your due date. A few of us pregnant moms have had questions about vaccines during pregnancy too, but honestly, ito na talaga ay something between you and your doctor lang, they know your full health picture at your baby's status. Don't worry, they won't judge; they just want to make sure both you and baby are okay. Sending you hugs, go get checked na!