When I was 12 dpo I had a faint line but then I start bleeding so I thought it was my period so I stopped testing. I started my period 2 days early and it ended 2 days early.. since I’ve started getting periods at 12 I’ve always had a 7 day period never shorter or longer.. so now I’m wondering if it was a chemical? I also had very tender boobs from ovulation to when I started bleeding which was also new. If this was a chemical would I get a period soon or it kind of mixes in?