Im annoyed.

I developed pre eclampsia with my last pregnancy in my third trimester so I’m at a high risk for developing it this pregnancy. I have to be conscious of the signs: high blood pressure, head aches, upper quad pain, swelling and change in vision. If I have any of these symptoms I’m supposed to get checked out. Well, for the third day in a row I’ve gotten a head ache so I decided to come in to the woman’s clinic at the hospital to get checked out. Just to be safe. Blood work came back fine. Blood pressure is fine. Baby is moving fine. Headache is gone after they gave me medicine and I don’t have protein in my urine yet they’re keeping me over night. Why? Because my doctor isn’t available and the on call doctor “never sends anyone home”. Can I just request to leave if they don’t have any reason to keep me if all test are fine? It might be because I've had a rough last few days but spending the night in this hospital is not ideal if it's because the doctor just doesn't wanna come up here and discharge me.