It’s need some advice or some experience help.

Ok I think I need advice. So quick background I’m having my 4th child. I’ve had to have Pitocin to help me dilate for 2/3 yesterday I had an ultrasound that told me the left side of my uterus isn’t getting enough blood flow. And that baby’s umbilical cord is a little outside of the placenta. They also consider me obese. And are concerned about the possibility of preeclampsia due to the left side of my uterus. I’m not to sure on how contractions are supposed to feel. But I’ve been having a pain that kind of makes it hard to breathe, concentrate and stand. Should I tell my doctor or do you think they’ll tell me it’s normal in pregnancy? And I have an appointment next week. With my ob. They say everything with baby looks great but are concerned. Is it possible I’m having Braxton hicks and it’s just stronger? Side note baby is in 64th percentile so he is really big they said.