EXTREME weight loss during pregnancy?

Erin

The day I found out I was pregnant (June 15th) I weighed 240 lbs. August 7th at my OB appointment I weighed 220 lbs. 2 days ago (September 13th) at the ER I only weighed 175.5. I also found out I have high blood pressure and I had preeclampsia with my son so I'm worried. Btw I have PCOS too.

Anyone else seen this in pregnancy?