Can u get pregnant 6 weeks after having twins? While expressing & no period

Natalie • From London, England UK expecting boy/girl twins june/july ❤️😊
So I had my twins 6 weeks ago and started on a low hormone pill as I express milk for my twins every 3 hours and don't want it to affect my supply. Last night me and my partner had sex which first time since we had the babies but no condom. I started the pill two days ago and been expressing since babies are born, can I get pregnant again? I haven't had a period since the twins were born as well. 
Thanks 
Natalie 

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