Help a girl out

Daniele

In Nov i ended my period the 26th full 5 day period. The app then says i was ovulating from the dec 3-7. I had sex on Dec.11th.I got my period late & it was a very short weird period from dec 20-22. My period isn't due again until jan 17th. But for about 3 days off and on my breasts are extremely sore. Could i be pregnant. Or is it just my period coming down. I only had sex once. & it was not during my ovulation windows. Plus i did kinda get a period it was just a short weird period

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