Is 3 months regular not enough?

So I've always had really irregular periods. This past October when we decided to start ttc, I went to the dr and they gave ne tips to regulate my cycle. I did them all and they worked. Awesome right? I've been regular since December. Glow has always been a little off on my cycles but I've noticed a fairly consistent pattern. But all the sudden this month . . . Nothing. No PMS signs, no symptoms, no aches, pains or cravings for sweets like normal, no breakouts. Nada. Is 3 months long enough to determine a pattern? Glow has me set to start af tomorrow but its CD 39 for me but I haven't been going this late. Advice?