Just Got Off Birth Control

I’ve been on oral contraceptives for 10 years. I just got off them this month. DH and I are TTC. <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> asked how long my cycles are... I just said 28 days because that’s what they were when I was on BC. I have no idea how long my cycle is going to be now that I’m off BC... I’m guessing that messes up the ovulation predictor. I did use OPKs and had intercourse when they came up positive. Now it’s time for the fun waiting game of when AF is gonna make her appearance (if she even does...) and when I can start taking pregnancy tests. Anyone else have this issue before? How long did it take you to conceive after getting off BC?