What could this be?

I recently posted this..

I’ve been off birth control for three months now. My boyfriend pulled out while we were having sex, came a bit (it was dripping) and then put it right back in, will I get pregnant? Not sure if me being off birth control for only three months will make it harder to get pregnant, or if my body is back to normal and I can get pregnant at any time.

Now, I find myself having a sore back(I never ever have had a sore back during my period or not), bad acne and emotional. Is this AF coming or could I possibly be pregnant?

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