Mama, please call your OB right away or go to the nearest clinic/hospital if the pain is really bad, wag maghintay pa! Any sudden change like yan, lalo na sa pregnancy, kailangan i-check agad ng doctor para sigurado ka.
I know it's scary when something changes, but your OB is the best one to explain kung normal ba yan for your body or if kailangan i-adjust ng medicine. A few of us mums have had reactions to different meds, pero talaga, case-to-case lang yan, only your doctor can tell. Hang in there, and please don't take any steps on your own; go see her ASAP, okay?