Ovulation first and then cohabitation or first cohabitation after ovulation easy pregnancy

Female eggs can survive 1-3 days in the body, sperm can also survive 1-3 days, so there is no so-called first ovulation and then cohabitation, or first cohabitation after ovulation, because as long as 1-3 days before and after ovulation, there is the possibility of pregnancy. Ovulation is a phenomenon quietly carried out, normal use of existing means can not accurately judge ovulation time, can only be counted as a period of time ovulation time, so there is no need to deliberately in the same room before ovulation or after ovulation, as long as in the same room ovulation or ovulation before and after the same room, there is a possibility of pregnancy, and pregnancy no matter when the embryo is not affected, so do not be demanding.