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If you are having regular menstrual cycles of 28-30 days, then chances of pregnancy are possible as you will still be in your fertile days bracket (for a regular menstrual cycle of 28-30 days, the usual fertile days would lie between day 8-18 taking day 1 as first day of bleeding). The chances are higher if you have had late ovulation during your menstrual cycle. Look out for development of any other new symptoms if pregnancy is suspected. Wait and watch for your periods. If periods do not start within 10 days of expected period dates, or if you get 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.