M.G.
Are you on the mini pill or anything? I was even though breastfeeding - because once they sleep longer than a certain amount of hours, you can get pregnant, and you can spot/ovulate, so it can all be signs that you're fertile. I had some spotting and was told for me, it was 'normal', but it was different after all my babies. I would go in and check with your doctor. It could mean your period is coming back
ETA: Is it continuous spotting? Some women's first periods are just that - spotty (or like a very light period). It's different for everyone. Best to make an appointment and describe it to your doctor. Start tracking it.