Sharp pain in lower abdomen and lower back what could it be?

Katelyn
Alright so I had sex on Monday. It was unprotected and yes he ejaculated in me. Well today is the start of my fertile  time. I'm not sure if the sperm could have lived this long but it was a weird sharp pain that lasted about five minutes then went away. Could it be that I may have ovulated early? I also just got over my period last Friday. 

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