I just want to know whether it is necessary for both husband and wife to attain orgasm at the same time in order to get pregnant.

It is only necessary for the male to achieve orgasm since the male orgasm is what triggers an ejaculation.

Actually the male does not have to reach orgasm since there is sperm in the early fluid.

All that is needed is sperm to enter into the women

Actually the male does not have to reach orgasm since there is sperm in the early fluid.

All that is needed is sperm to enter into the women

True, pregnancy is even possible without orgasm, but is more probable with full ejaculation.