according your description both the possibilities are there,
so you better go for blood test
which will rule out the possibility, if comes negative then your period should be hypomenorrhea
means scanty flow during periods, it can occur because of many causes like anemia, hormonal imbalance etc, usually that can get corrected by next cycle if not better to consult doctor
once to get investigated.
if you want to conceive better to track ovulation by natural methods like cervical mucus method or by ovulation kit and plan intercourse around that period which will increase the possibility of pregnancy.