Gaining weight 😪

I keep gaining weight despite really not eating more than I have since the second trimester. I am so confused. I am afraid I’m going to go into my 36 week appointment on Thursday and they are going to send me straight to the hospital because of Preeclampsia. I am afraid it’s developing although they checked me at 34 weeks and I was pretty normal. Idk I’m not having any crazy symptoms I’m just scared to get it and not really know I have it...