no I highly doubt that you are id she has a cycle of 28 days her fertile period would have been around june 2-7 with the resulting pregnancy due around the 26 feb....
nan average 28 to 30 day cycle a woman ovulates around the 14th day. Say if she had a period on the 25th she should ovulate around the 8th of the next month. This is average.
If the last time you were intimate with her was on the 23rd and her lmp was on the 22nd she could possibly have gotten PG while she was on her period. Unlikely but it does happen. Since the dates are this close DNA is the e only way to know for surefg
Get a DNA test, that's the only way to make sure 100%!!!