Confused....Newbie

Hi Glow!!! I recently had a miscarriage in July with our first child which ended with a D&C. Decided to try again. Started Metformin ER two weeks ago. My average cycles lasts about 32 days. My last AF started on 10/23 which makes her due around the 24th of this month. Yesterday I had some mild cramps/pulling in my pelvis area that really cases my lower back to ache. Took a FRER with FMU this morning and got a negative. I'm having other obvious symptoms (nausea, tender/enlarged boobs). Did I test too early??