Bleeding during pregnancy?

How many people bled in early pregnancy? Was it fine? Currently 5 weeks and 6 days. I've been off and on spotting brown and pink blood/discharge since Friday, its now Monday. I called the OB and she had my hcg checked Friday and it was 1200 and this morning it was 3300 so it's still doing what it is supposed to. I'm STILL worried. I didnt bleed at all with my first pregnancy. It's not a huge amount, mostly just when I wipe, nothing on my underwear. Not super dark. Anyone have some experience with this?