A few days ago I had a few possitive tests, and ever since I’ve been getting negatives. I’ve missed my period, boobs hurt, constant headaches like the beginning of pregnancy. However the lines have completely stopped showing now so I’m convinced it’s a chemical. How long does it take to start bleeding, is it dangerous?, I had a miscarriage last year and needed to get medical involvement to help get it out ( sorry ain’t the best at wording things )