My fertility window changed.

Stacie
When I went to put my bbt in this morning I noticed my fertility window moved to starting the day after my period. I am worried it did that because of my temperature. I have had a sinus infection for a couple of days and ran a fever. Now I am not sure when I was fertile. Is this normal for it to change? My original starting day was the 19th and the 25th was the end day.

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