So scared!!

Shelby • ! My oldest is two born {1.17.14} & my youngest was born {2.16.16} blessed mommy of two beautiful baby boys!
My son will be 7 weeks Tuesday... I stopped bleeding at 3 weeks pp. Well around 5 weeks pp I started bleeding.. Well I thought it was my period so I put a pad on. I went to the bathroom maybe an hour later and I wasn't bleeding. Me and my husband have been sexually active.. The first time he did it he was late on pulling out. So now I'm wondering if that was really implantion bleeding.... I'm so scared I go to my pp appointment tomorrow and I'm super scared she's gonna tell me I'm pregnant bc this would be my third baby I already have a two year old and now my 6 week old! Gahhh I'm so stupid!!!