Around 28 weeks I told the nurse practitioner at my doctors office that sometimes while laying down on my back or side it'd feel like someone was sitting on my chest.. she told me it was heartburn and told me to take meds for it.. I've never really had heartburn so I wasn't sure if she was right or not.. I didn't take any medicine or anything and it doesn't happen as often now I'm 32 weeks.. but if you're worried I would definitely ask
When does it happen? Laying on your back?