I was on the Pill too and my periods were all over the place, convinced I was infertile- but nope, the little thing still managed to wiggle its way up.
I'm all excited now, so fingers crossed it sticks. I seem to wake up every morning convinced I've lost it haha. Good luck on your scan and it'll be awesome if your roughly the same along as me, be great to have someone around. Everyone seems to be so far gone!