my stomach is swollen, PCOS or pregnancy?

Hi,
Welcome to ehealthforum,
The symptoms of bloating, heartburn, nausea, altered period pattern changes, appetite changes, etc could indicate pregnancy possibility. Other possibilities include hormonal derangements, thyroid abnormalities, endometrial polyps, ovarian cysts, uterine fibroids etc. Report your symptoms to your treating doctor/gynecologist and go ahead with getting further evaluation to look for the underlying cause. If you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). If pregnancy gets ruled out, further evaluation would be done to look for the underlying cause for your symptoms. Treatment as appropriate (based on examination findings and investigations results) would be started to help you control the symptoms and regulate your periods. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle.
Take care.