Call your OB or go into the ER and they will a send you up to L&D and check baby for you. I had a lot of stomach pain at 20 weeks and still do and its just round ligament pain which is common and normal. However your having period like cramps or abnormal discharge go to ER ASAP. Pregnancy can cause a lot of weird feeling, and symptoms. Best thing to do is speak to your doctor or call the nurse Line and get some advice. Good luck !!!! Hope all is OK.