I'm 21 years old unmarried girl. I had an unprotected sex with my boyfriend on 17-18 March, 2016 after this on 19 March, 2016 I got my proper periods. My periods usually comes on a gap of 25-26 days but on April my period came at the gap 22 days means 3 days before than a expected period date on 11 April, 2016 and it was just a brown light spotting for 2 days and then suddenly become very heavy bleeding from 3 to 7 days i'll never experience this type of periods. Then on 23-24 of April, 2016 incidentally again i have an unprotected sex with my bf after this I got my periods 5 days late than usual this time again it was very less bleeding than my usual periods i'm very much confuse. That it was just a. N�?mal period or implantation bleeding or any early sign of pregnancy. Coz after all this i'm not feeling comfortable from past 2-3 week I suffering from headache, constipation, heartburn, heart pain, pelvic cramps occasionally, breast tenderness - soreness and shoulder pain i'm very much tensed by this coz i'm unmarried I can't take any risk of pregnancy. I will take an Home pregnancy test with Preganews 3 times in a month 1st on 1st May, 2nd on 21st May and a 3rd on 29th May it all comes negative. After all this yesterday on 2 June, 2016 I got my periods its again just a brown blood light spotting very much different from my usual period. Last time I get my proper satisfying periods on March after this month I didn't got a proper satisfy periods. I'm very much tensed that is i'm pregnant? If yes then y test comes negative and if No then why my body having all early symptoms of pregnancy and a periods like this from 3 months-april, may and june. Please help me. I know I did a big mistake but I can't repeat any mistake anymore please help me out from this situation.