Uy, I can really hear the worry in your message, mama. Since you're already on meds and having regular check-ups, that's good, pero if the pain gets worse or sobrang intense, don't wait for your next appointment, okay? Go to emergency na lang para peace of mind mo.
At 16 weeks may mga cramps and aches talaga, lalo na if may contractions, a few of my mum friends went through similar scares, and honestly the worry sometimes mas painful pa than the actual cramping. The fact na okay ang baby and active pa siya is really reassuring signs, ha. Keep doing your bed rest, take your meds on time, and try to rest when you can, I know it's hard not to stress, pero your body needs the calm din. Anytime bago ka mag-worry, call your OB, yan ang best mo gawin when you're at home, kasi sila lang talaga makakasiguro kung okay ka. Kaya mo yan, mama.