Our first month trying and metformin blues

Ok, so I have been on metformin (500 mg, 2x a day) for a little over two months now. My husband and I decided to start really TTC this month. I'm 9 DPO and the last two days I've been nauseated every time I eat and I've been really crampy. I can't tell if it's because of the meds or it's pms or maaaayyyyybbbeeeee a little baby? Advice for this would be great, I feel kind of alone in this.