this is so embarrassing. a few months back I found out that I got trich from my ex fiance. i took the 7 day one but it didnt seem to help so i took the 4 in one day. it cleared up the next day but on the third day my period came. im on the depo shot so my periods last for log periods of time. this time 4 months. I havent had sex but how do you know that it is gone?