No. You will get all kinds of different answers here, but my personal feeling is that chiropractic is predominantly based on a nonscientific and incorrect view of human physiology, and will do you no long term good pregnant or not. Some chiropractors will manipulate in pregnancy, and some not. I doubt its dangerous for the baby. Chiropractic manipulation to vert breech infants is bogus.
No. Chiropractors have nothing to offer a pregnant woman and the deep manipulations with no actual diagnosis can be dangerous to the mother and even to the baby. Discuss your symptoms with your obstetrician.