Ay, mama, I need to be honest with you, these sensations you're describing, lalo na kung may pain involved, deserve a proper check-up from your OB. Please don't wait; go see your doctor or go to the nearest hospital/clinic, okay? It's better to be sure, especially when something feels off down there during pregnancy.
I know it's scary, but our doctors need to examine you properly para malaman kung ano talaga ang nangyayari. Sending you strength, and please update us once you've seen someone!