Overthinking?

My cycle is usually 28-30 days. Last month my period was a week late (making cycle 36 days) and this month I was supposed to start last Friday (today is day 36 of my cycle). Since I'm trying for baby #2 and got BFNs last month, I haven't tested this month to avoid disappointment. I don't feel pregnant, but don't feel like AF is coming either. Am I crazy for thinking something might be medically wrong causing my periods to all of a sudden be so spaced out?