Having period like cramps every time I lay on my sides. The doctor prescribe me ranitidine for reflux at my 28 week visit yesterday. This started after taking that. I had to lay on my back last night but as soon as I laid on my left the menstrual cramping came back. I called my doc's office's nurse triage and she told me to monitor how many of these cramps I get in an hour. So far 7 in the past 20 minutes but it just feels like waves of pain that comes and goes. This is my only symptom. 😳. Baby boy is moving around.