Tsuzuki-san
1) You could have cummed. The filling up feeling could have been caused by your cervix pulsing, basically in and out. (It does this while orgasming, it is the body's way of collecting the sperm to increase the chance of pregnancy.
This is a good example of why it's tough for us to answer your question. People experience things in different ways. When I orgasm, I do not feel "full" in any way. Most women describe orgasming as feeling like the walls of the v****a clench and release a few times, but everyone is a little bit different.
Tsuzuki-san
2) I know from personal experience that you
can feel a guy come. This could be the cause of the "filled" feeling. When a guy comes, his p***s pulsates... this may be large pulses or small pulses. It really depends on how hard a guy comes.
To clarify, I never said it can't be felt. It's just very extremely rare for the female to feel the male ejaculating during vaginal sex given the placement of the nerves in the v****a. Most women cannot feel it.
Tsuzuki-san
You would have known if the condom broke. There would have been a lot of fluid either running down your legs or on your bedsheets if you decided not to get dressed afterwards, or a lot of fluids would be on your underwear.
How much semen there is can vary, so it might not be that black or white. I have had partners who seemed to have a lot, to the point where if I got dressed right after, it would all be running down my leg and making a wet spot on my pants. Then I have had other partners where the semen wasn't really very noticeable, and I did not need to sit and "drain" before getting dressed.
Also, a condom could have a very small hole allowing only a little semen to get through.
Tsuzuki-san
But I do have a piece of advice for you (I tell this to everyone who is sexually active): Double up on contraceptives. Go on the pill as well as using a condom. Neither is 100%, but doubling up decreases your chances by even more, so if the condom does ever break, you have a back-up.
I agree. A hormonal method and a non-hormonal method are a great team. That's another reason why it's so important to get to an ob-gyn!