Looking for advice...

Hello. My fiance and I have been trying for a few months to conceive and this last month my body has been all over the dang place! Started with nausea (which I still am getting) then mild cramping to avoiding all meat at all costs (I love my steak so hugely weird!) I've been super tired, on new years I 'took a nap' at 1PM and didn't wake up til 5am the next day my period was 2 days long, not heavy and weird. I took a test and it was negative and now I've been havin all of that plus horrible heartburn in the mornings. I have an appt with my dr Thursday bc I'm at a loss. Any advice is greatly helpful!