At what point do you start to wonder (or worry!) if you're pregnant?

I just realized I'm on day 35. My last two cycles were 33 days and the two before that were 31 days. 35 is not uncommon for me, so I'm not freaking out (yet), but now I'm starting to have the "is it possible" conversation with myself!

I hate having irregular cycles- and not having any permanent bc measures in place, I always find myself getting nervous around this point. If I go beyond day 40 I'll start to panic. DH is pretty certain I'm fine, but you just never know!

Anyone else go through this? What's your "hmmm..." number?!

I really need to start keeping better track of when I ovulate!