Confused

Catherine

I thought I had fairly regular periods. In the last year, they have been 30 days on average. I have only had one that was more than 32 days in the last year and it was 35. I am now on CD 37. Positive OPK on day 16-17 and peak 18-19 with Clearblue Advanced Digital. We were not TTC this month, but we had sex on CD 27 without protection. We were planning on trying this month, but now I have zero clue what my cycle is doing. What the heck?