Good evening girls. I'm 28 weeks pregnant. In the evenings my belly is…

Good evening girls. I'm 28 weeks pregnant. In the evenings my belly is starting to feel numb and today there's a pulling pain in my lower abdomen. It's not strong, it feels like a weak period pain. The baby is acting normal, kicking. I read online that this could be contractions, maybe hypertonus or detachment. I have an appointment with the doctor next week. Should I panic and call an ambulance? Has anyone experienced this before?