28+ 5 now being seen weekly... Twin moms should i be worried

Tara • We're expecting twin identical Girls
I'm freaking out , been having slight contractions been giving me bp meds to calm my uterus . Neg. On early labor test,but been having a lot of pressure n Dr can feel babies head low but not pressing on cervix... I'm in so much pain kinda a stabbing feeling down there.. I'm just trying to prepare myself if these girls decided they want to come early. I'm OCD with 4 other kids, I just want to be ahead... Anyone had similar symptoms?????