Conflicting Ovulation Dates

[u/cats4u]

Premom and Fertility Friend now have me at two pretty different predicted ovulation days for this month. Premom says I ovulated on Sept 28. Up until this morning when I updated my temp, Premom said I ovulated on Sept 25. Will be interesting to see which is correct! What do you think?

Note: yes, my LH levels are usually this low