Pregnancy test

I have irregular menses (28-36 days) but since I did the BBT charting, I can know if I am ovulated or not on each cycle. So around day 27 (or 13 days past ovulation), I will start to test. Then I will retest again on day 30. Based on my experience, I can get a positive pregnancy test around those days. Clear Blue (both digital and non-digital, can detect faster than the guardian), but usually, I like to have stock on the guardian brand (2 pcs in 1 pack).