Hi... I am 19 year old girl. I am having regular periods since 3 months but when I started having sex with my boyfriend I started taking ecp pills. Fews days back I had my normal periods and then on 6th day I had sex and took pills after sex. Then on 11th day I again suddenly had pain in stomach and in early morning periods started normally again. I want to know why periods come again so early? Is it the side effect of ecp pills that I took after sex? Or it's a major complication?

Ecp, as in emergency contraceptive pill? Those pills are not meant to be taken all the time. They're called emergency for a reason. They're high doses of hormones. So yeah, that could definitely screw your cycle up taking them regularly. Go to the doctors and get regular because pills so that you can have normal doses of hormones or learn to use condoms.