Hello. Yes of course, you can try on these days and you will be pregnant surely,  no doubt. After ejaculated sperm into the vagina,  the sperm can remain in uterus for maximum 3 days. So I advice you to try multiple times and you will have good news,  you will missing your periods and after 7-10 days, you can confirm it by yourself with pregnancy test kit. The instructions are written on the kit. Regards.