Differing cycle lengths

Kasey

My last cycle was unusually short (24 days) it has been pretty consistent at 26 days since I stopped taking the pill in Apr. On another app it is telling me my period is due 4 days later than this app 🤷🏽‍♀️ I’ve been TTC for 5 months now. Had positive ovulation tests for 2 days this month on CD’s 12 &13, just trying to figure out when to take an early detection test. Any advice ladies?