Yeah it is just normal. Early stage of pregnancy, mummy will face different types of symptoms. However, if your pain is very consistent and you are in doubt, do seek advice from doctor/gynae. To reduce heartburn you can eat in small meals, no caffeine, no spicy food and seat up right. You can try Gaviscon as per some pregnancy mummies that have tried it but I personally have not been taking it. Instead I get direct prescription from doctor.
GG