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Mild spotting, mild abdominal cramps, lighter bleeding, delayed periods, nausea, food cravings, tender breasts etc could suggest possibility of pregnancy. Visit your doctor/gynecologist for further evaluation and assistance if periods do not start within 10 days, or if you suspect chances of pregnancy, or if you develop any other new symptoms. 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. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately.
Take care.