You have to wait for first date of missed period and do a urine test for hCG within 15 days.If positive, then do a usg & blood test
before next missed period for confirmation.
No relation with previous abortion and you are not saying the cause of that if any.
Stomach burn may be an indigestion
problem..for this u take small carbohydrate
diet rich in veg, drink plenty of water , avoid fatty meal or alcohol, do light exercise.
Use medicine like non systemic antacid, H2 blocker ie.Rantac, or Sucralfate.