thanks for the query.
Your symptoms of missed periods with spotting per vagina suggest that you are pregnant and may be going for miscarriage
I recommend you to get a urine pregnancy
If it is positive then get an ultrasound
to more sure of your pregnancy and its complications.
A small sub chorionic hemorrhage can cause spotting . But it regresses on its own.
50% of women with 1st trimester bleed continue with their pregnancy and deliver a healthy healthy baby. So dont worry. Take adequate rest.