Why did I miss my period?
Last month I had my period and just started dating this one guy. A few weeks ago we started fooling around and everything and it led to some serious stuff. Im still a virgin and all but when we messed around he put it in and he told me that he c***d on my stomach but he didn't put it in all the way but im so scared if some got in me. I really don't want to be pregnant abd my stomach has been a little weird these past few days.is there maybe some other reason why I missed my period so far?
Unless I am misunderstanding what you mean by:
"... he put it in ...<snip>... but he didn't put it in all the way ..."
then I am sorry to say that (at least in my opinion) you are no longer a virgin.
It is irrelevant what he may have told you regarding where "... he cummed on ..." you.
Your description makes it absolutely clear that you have been involved in unprotected sex play during which both coitus (albeit short duration) and ejaculation occurred.
You now explicitly say you have missed your period, and ask "... why ...?".
Sadly, there is a very real possibility that you are now pregnant.
If this is a false alarm and you "... really don't want to be pregnant ...",
then you have been very lucky and I strongly recommend that you start to take proper precautions against unwanted pregnancy until such time as you are planning, and ready, to raise children of your own.
I wish you all the best whatever the outcome.
Don't fool yourself. You are no longer a vir.gin. You cannot "almost" have sex. As long as he went inside you, even part way, even a little bit, you had sex and are no longer a virgin. Get yourself on contraceptives if you are going to engage in sexual activities. Since you had sex, there is a chance of pregnancy. I would go buy myself a pregnancy test.
Totally agree with the above. He entered you, you are no longer a virgin. Stop being in denial about your actions. You know very well why you could have missed your period.