METFORMIN question

So I got diagnosed with PCOS last month (May) and the doctor put me on birth control and metformin for 3 months because after that we want to try to conceive. So Yesturdday was my first time taking metformin and about an hour i started using the toilet like major diarrhea (very loose - water like) and i puked .. is that normal? Also today, after i took the bc and metformin i had watery stool - again is that normal?