Anyone else have this experience?

I'm getting slightly annoyed. I stopped taking my BC at the end of January but my hubby and I are not "trying" yet. We are just simply stopping trying to prevent me from getting pregnant without all the stress and pressure. I've been logging my periods with glow though just to see how my body is working without BC. every month my cycle has gotten 1 day longer; this month now seems like it is going to be 3-4 days longer (now on CD 34). Is my body still trying to regulate itself?! or do I need to start doing the whole bbt and opk  thing? I have no idea when my true fertile window is or has been since my cycle keeps getting a day or two longer.