Acupuncture is completely safe and effective treatment during pregnancy. In fact for certain conditions like late-stage back/pelvic pain it is one of the only options as you cannot use pain medication at that point. The value of it for you depends on the issues that you are having. Essentially everything can be treated from early term morning sickness, fatigue, etc. to late-term low back/pelvic pain, breech presentation, etc. The majority of patients I treat for fertility issues will return for visits every 1-3 months for follow-ups which insure they have a smooth pregnancy and ultimately an easy birth. There are certainly points that are contraindicated during pregnancy, but every professional is fully aware of those points and there are no cases that I am aware of where any problems have ever been caused. Acupuncture is ultimately a natural phenomena in the way that it works on your body, so is pregnancy - generally speaking it is extremely hard for acupuncture to over-ride natural processes in the body that are functioning well.
My article on treating the range of pregnancy and child-birth related issues may be interesting even if it is a bit technical in it's presentation.