possible to be pregnant not having period or ovulating

Hi,
Welcome to ehealthforum,
If after stopping your birth control use, your ovulation/fertility had returned back to normal, then being sexually active without protection can result in pregnancy. The symptoms that you describe (missed periods, lighter periods, absence of usual PMS symptoms, harder feeling abdomen, changes in appetite, sensitive nipples) could be few of early symptoms suggestive of pregnancy. Wait and watch for your periods. Look out for development of any other new symptoms if pregnancy is suspected. If periods do not start within 10 days of expected period dates, or if you have got abnormal periods, or 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). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.