30 weeks pregnant and haven dark discharge

COuld be a number of things depending on what the discharge looks like- Infection is one or if its blood tinged and you have recently had intercourse or even had a um, difficult bowl movement this could cause some bleeding in your cervix at this time...all the hormones in your body makes the blood vessels in your -area- much more full and sensitive...so if its not bloody go to triage or call your doc (depending on what your protocol is) if it is you can still call your doc to be sure or just relax and know its normal :-)