Help!

Someone help me ! How long can implantation last .. I've heard 1-3 days or more and it may get slightly heavy .. I'm not sure for my period until the 5th but I started sporting on yesterday off and on and today , it comes and goes.. no cramps or anything , but I have nausea .. July I had sex multiple days during my fertile window according to FLO . I had it 4 days before ovulation and afterward ... August I bled off and on 9 days.. never had a period that long .. someone help me please 😔😔😔 I really want baby #2... My daughter is 4