My Period Got Ovr On 14th Septmbr And Thn On

My period got ovr on 14th septmbr and thn on 17th i had sex with my partner in the morning and in the evening i had ipill. And thn again on 18th morning i had sex and he released his sperm inside me.
So is thr any chance of me getting pregnant?
Yesterday i had little blood flow aftr that m only having back ache..
Please suggest what should i do.!