Worried! Kinda ?

Okay long story short,. I had sex 3 days after my period ended. But here's the catch. I'm super irregular,. Like months without a period irregular,. And all I want to know is can you still get pregnant or no? I don't want to be,. But it was our first time and I'm anxious to know! And we used protection :) 
Thanks for the help! <3