Positive test but regular period

hi, I'm new to all of this. I'll try to make this short. 

im 27 and my husband and I have been trying to  conceive for the past 3 months. I've always been irregular. I normally have 60 day cycles. But recently I've lost 30lbs so my periods have been coming a little more normal. But this month I thought I was implantation bleeding cause I had super light spotting so i took a pregnancy test and the positive was super light so I wasn't to sure. But hours after taking that test I started bleeding more like a period. I'm not to sure if this is miscarriage or a chemical pregnancy. I'm not to sure on what to do.