Will the woman's having an orgasm after receiving his ejaculation give a better chance of have a baby?

No. Female fertility and chance of conception has not been linked in any meaningful or direct way to whether she achieves orgasm at any time during the process. Obviously, a woman's reaching orgasm while trying to conceive may be very healthy for many other reasons, during what is potentially a stressful time for couples.
No. The physical effects of orgasm include movement of the uterus and some pumping action, known as up-suck that could help sperm move up through the cervix. This effect is rather mild. The emotional effects of orgasm are more important - fertility is dependent on trying over and over again, and improving desire and attraction is key to this.
Orgasm & Pregnancy. A female having an orgasm after her partner ejaculates will not increase the chances of conception. Pregnancy depends upon the fertilization of the egg by sperm, and this can happen independent of a woman having an orgasm.