Why does my ob want me to go Labor and Delivery??

I’m 21 weeks 3 days. My legs and feet have been swollen the last 2 days, I’m drinking enough and elevating my feet and still nothing. I asked her opinion on what else I can do,

She asked me other questions of having headaches, Braxton hicks & increase discharge.

I said yes to all and frequent Braxton hicks a day and she said for me to go to labor and delivery.

I haven’t been able to drive myself there yet because all of a sudden, I keep seeing blackness and I feel very out of it. My brain is very foggy… I almost feel super high (obviously I’m not) but I have to wait til my fiancé gets home from work to take me.

Anyone go through something similar ????