Case of the missing AF... 🧐

If I keep getting BFN’s, what could be the reason for my missing AF? I used to be very irregular when I first stopped BC and didn’t get a period for almost 1-2 years but have had pretty consistent cycles the past 10-11 months. No recent change in weight or diet and I’ve been tested for PCOS a while ago and I don’t have that either. Any insights??? 🤔