No Period - Pregnant? worried a test will come out positive

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The symptoms could indicate possibility of infective causes, endometriosis, cervical erosion/dysplasia, PID, etc. The symptoms of delay in periods, abdominal cramps, tender nipples could suggest pregnancy possibility. Wait and watch for your periods. Look out for development of any other new symptoms if pregnancy is suspected. If pregnancy is suspected, or if you miss your periods, or if you have abnormal periods, or if periods do not start within 10 days of expected period dates, 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 confirmed, consider getting serial HCG levels estimated. Doubling up of the hormone levels in 48-72 hours will show that pregnancy is going on smoothly. If levels are not adequate, then external hormonal supplements would be considered to be started to help you in preventing miscarriage/threatened abortion. An early ultrasound scan done will help to know if pregnancy is intrauterine or ectopic along with confirmation of gestational age and viability.
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. 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. If infective cause is detected, get your partner also treated simultaneously to prevent chances of re-infection and avoid having intercourse while being on treatment.
Take care.