Hello...I'm a newbie here. I had my last period on the 14th of Septemb…

Hello...I'm a newbie here. I had my last period on the 14th of September, lasted till 17th, had sex with hubs on the 19th, we had sex again on the 25th, 26th and 27th of September when my ovulation was very high, I'm pregnant and I want to know if it's possible to have gotten pregnant after the 19th sex. I'm asking because I really want to have an almost accurate time frame of when conception happened. Thanks.