Comment if you will

I have a almost three year old little girl. I had hypermesis with her and was on zofran my whole pregnancy and she come out completely healthy. I’m currently 6 weeks and 4 days pregnant now and I’ve just started to feel nauseous almost all day and my obgyn told me she doesn’t want to give zofran to me until my second trimester. My primary doctor however prescribed me the zofran. I’ve only take once so far. My obgyn wants me to try Phenergan. I’m so confused on what to do.