Hi sis! Aw, that combination of jaw pain, headache, and neck pain during pregnancy does need proper checking, please see your OB or go to the clinic soon, okay? It could be tension, posture-related, or something else that your doctor needs to assess, especially since you're 3 months along. A few of us mums have had similar aches during pregnancy, but it's really best to get it checked para sure at safe ang baby. Hang in there!