Confused

I have pcos, so please don’t judge... my periods are usually irregular and right now it’s “45 days late” I take pregnancy test religiously and all say negative... But my question is I just had sex for the first time in almost 3 months last night, he “came” inside me, is it possible to still get pregnant even though I’m not getting a period ? I’ve had trouble getting pregnant in the past, had 2 miscarriages, & 1 live birth (he’s 7 now) ...