Is this feeling normal?

At first glance I thought you were talking about having the feeling of needing to pee, which could be an indication of getting ready to ejaculate. However, "poo" I have not seen in women I have been with or coached unless there was something inside their anus.

I would say if you are a little uncomfortable at first then it is probably because you haven't bee sufficiently been aroused. Typically when you are fully aroused then your body relaxes including your vagina and the sensation, from what I've been told, is usually pleasurable.

Hmm. if you stick your fingers into your vagina and press downwards towards your anus you can get this sensation. I've never had a guy do this to me, but I've accidentally done it to myself. Give it a try and see if that's what it might have been. If so, tell him to try to press upwards as opposed to downwards next time. Also, I believe that the pressure from a penis is normal. I'm still a virgin, but it seems like this would happen as a result of the size differences of a penis and a vagina.

umm poo no, but sometimes it gives me the sensation to pee, and as for the other part of the question the pressure of it going in is my favorite part but it could feel uncomfortable to other people

your body's generated or generating some vaginal fluids so it does make you have to pee, but it acts like the lubricant when you're having sex, because the finger is acting like the penis.