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.
Is it normal to still have sex after conception?
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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.