I'm currently taking BCP (Junel/Loestrin) and I have never missed a day. My boyfriend and I had unprotected sex on June 9th, if that's any help. I got my period June 14th and it lasted for only three days up until the 16th. But it was fairly heavy so I know it was my period. From the 17th-today the 19th I have been spotting (dark red/brown) and it hasn't stopped. I'm suppose to start up again on my next pack of pills tonight. Is this normal? Is it implantation bleeding?