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The spotting could be due to decidual bleeding, or even indication of threatened abortion (if accompanied with increased intensity of abdominal cramps, back pain or fresh bleeding). Visit your doctor/gynecologist for thorough evaluation. If pregnancy has been 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.