If a male and female take a bath together and the male ejaculates can the female get pregnant?

No, the sperm cells die quickly without the right conditions and will immediately die as soon as it hits the water.

There is 100 % no way the female could get pregnant solely from sharing the bath. However, pregnancy is possible if intercourse was taking place in the bath, or if the female's vagina was extremely close, but even then it's very unlikely.