My Amniotic Fluid low at 30 Weeks

I was told my Fluid was low when I was 27 weeks. Now I am 30 Weeks and 1 day and have to see a Specialist tomorrow. I went to the hospital the other night because my baby wasn’t as active and I was having a lot of pressure down there. They baby is doing great but they said I have a right to be worried because there is a chance it could be preeclampsia. No high blood pressure just the baby’s stomach measures 1 week behind and it could be related to the placenta because I am plenty hydrated. I am getting headaches all the time. Has anyone had this happen to them and what was the outcome?