Not sure if Metformin or pregnant

I've been taking metformin for a month and a half now. When I started, I felt like throwing up but was able to hold it back. The past two weeks, I can't keep any food down and my tastes in food have changed. I don't even like my favorite soda anymore. I'll be taking a pregnancy test after my period date if it is late but wanted to know if anyone had this kind of trouble with metformin.