Could i be pregnant?

ronnie
Well i had my last period may 29th-june 3rd. And i haven't got my period since, i have been having unprotected sex since the 9th and the 11th and 12th. But when i asked the guy he said he never cummed inside of me. Then i started having sex with this guy I've been dating and we've had sex on the 25th and the 26th of this month and both times he cummed inside of me. I haven't got my period this whole month! And I'm just wondering when would be the best time to take a pregnancy test? And by any chance why haven't i started my period? And is there any chance i could be pregnant from the last time i had sex? No rude comments please.