i found this on google x
Q. One word, orgasms.
A. Many answers to that one! Orgasms can be much different during pregnancy. Some woman will finally become orgasmic during pregnancy due to the increased fluids in the area making the clitoris and vagina more sensitive. Other women will become multi-orgasmic for the first time.
In general, orgasms are very good for you and baby! When you have an orgasm the baby is unaware of what you are doing, but does experience the euphoric hormone rush that you will experience. There will also be minor contractions of the uterus, as there have always been, but now that the uterus is bigger you can feel them more. This is not preterm labor, unless you have this cramping sensation or contractions for more than one hour. The big problem with orgasms during pregnancy is that, particularly at the end, you many not get quite the sense of relief that a normal orgasm would provide. I've personally walked away from sex feeling more sexually frustrated than before, despite multiple orgasms. Although, it's still worth it!