Metformin and constant bleeding?

Bri • Rainbow baby due July 2020 🌈

My doctor put me on metformin last month and I finally start my period after not having one since May, and I’ve not been constantly bleedinf (not heavy at all) but it’s there, for 17 days now and it doesn’t look like it has stopped at all either. Is this normal? should I ask my doctor about this? Thanks!