7 months now ttc

Torri

So now I'm going on 7 months ttc, charting, ovulation test, bbt, etc. This month I had 5 days in a row of strong postives on my ovulation tests. Every other month I've only had 1 sometimes 2 strong positives. I'm now 5 dpo if I go from the first day of positive opks, I'm just wondering why that would happen