Chemical

Hi all

On metformin... very irregular periods. Regular intercourse to try and catch it right. My question is this what symptoms of any did you have with a chemical pregnancy. I had light spotting and very light brown only when I wiped. When I did a pregnancy test it was a faint line worried was an evap line so did another. Another faint line. The next day negative. Called Dr and they said could have been a chemical. Bugs me though that I don’t know either way.