Is 33 weeks too early for that?
It could be your mucus plug.
Yes. Id call your doctor, jus to be safe.
It sounds like your mucus plug. It is not too early for you to lose it. You can lose it multiple times in pregnancy. You do not need to call your doctor. It is not an emergency. Mention it at your next appointment. If you continue to bleed with out the mucus, then call your doc.