I had unprotected intercourse on April 6.A week later I started having headaches,nausea,light cramps,backaches,and leg cramps.April 14 to April 16 theae symptoms still continued.On April 17 I've been having some pinkish bleeding.Im still bleeding pink as of today which is April 19.This bleeding is not like my regular period.Its a pinkish color,light,and no cramps.My expected period is April 22 or April 25.My period usually lasts 4 days,red color,and comes with cramp.Is this implantation bleeding?What is going on?