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I just got pregnant this week but i still have sex if as im not.
If he doesn't pull out, can the new sperm effect the first sperm or pregnany itself?
and is it normal becuz all of my friends who i've witnessed have kids never continued to have sex once they were pregnant.
Wow, no offence but you don't sound old enough to be having a baby. first of all, you said 'becuz'. second, 'the new sperm'? 'the old sperm'? WHAT? no. you don't 'store' sperm when you are pregnant. ONE sperm fertilises ONE egg, all the rest are disposed of. also, that ONE sperm, doesn't stay a sperm, it combines with the egg and forms an embryo. YES, you can have sex when you are pregnant. NO you shouldn't be having a child if you didn't know this basic information.
Sex during pregnancy is perfectly normal. Although there is a wide variation between women (some don't want it at all, others can't get enough) and desire comes and goes during the forty weeks. It's well worth having sex in the weeks before birth, because afterwards you won't be having any for months (not because of the stretching of the vagina due to childbirth, but because of the demanding schedule of raising a newborn).
To answer your question, sperm don't mix. In the very moment after the sperm enters the egg, the newly-created zygote toughens its "skin" to prevent other sperm from entering. This occurs in all sexual animals and is essential for sex to be effective way to mix genes from an evolutionary point of view (that is, the male which is strong enough or most attractive enough to have sex with the female first is the one who's genes are most desirable for reproduction and later-arriving sperm should be rejected).
Time to buy yourself a good book on pregnancy: "what to expect when pregnant" is comprehensive but scary, "up the duff" has much the same information but a much friendlier tone.
No, the "new" sperm won't effect anything. You can typically have sex, right up till birth. But when you are far into you pregnancy, take care into what positions you use. Lying on your stomach is not reccommended and any "rough" stuff is a bad idea too.
You should be careful, I have a friend, well I had a friend she continued having sex far into her pregnancy and ultimately she had so many fertilized fetus's in her uterus they began eating one another and when the strongest were left they started physically eating her.
Its called Fetal Eat-it-all Syndrome. Or FES for short. Just be careful.
Look it up.