Tailbone swollen and pregnant. How can I tell if its a cyst or just regular swellng? If it is a cyst will it go away on its own? Swellings calmed down

See your OB/GYN. Tailbone discomfort is almost universal for pregnant women in the last 5 weeks of pregnancy. If there is a growth to be worried about, you should talk to your doctor about it and maybe consider imaging tests after you have delivered.