It's normal- because in doggy style he can go really deep and he's probably bumping against your cervix. That's probably your problem the other times too. You might find that certain times of the month it hurts more than others. Try telling him to go less deep or you hold his hips or jump on top so you have control.
I HAVE THE SAME PROBLEM. It feels like someone is ripping me from the inside out! No other position hurts. I am not sure why but everyone says it isnt normal. IT dont matter how far my fiance goes its instant pain all the way to my belly button
If any insertion in that position hurts and no other position causes discomfort it doesn't sound at all like it's the depth of penetration. Do you experience simular pain when masturbating while in the doggy posture?
I get the same thing and have a condidion called 'tilted uterus' also known as 'tipped uterus', or a 'retroverted uterus', I reccomend you all do some research on the condition, it is actually more common than you may think, occuring in about 20% of women, most of them not even knowing it.