6 weeks with bleeding, help!

So I am 6 weeks along according to my OB! I have been having spotting when I wipe only, intermittently. I had my blood done for hcg levels last week. It went from 12,000-24,000 in 2 days! The midwife said it shouldn't be a concern and I may just be one of the 50% of women who bleed in the first trimester. Has anyone else had a similar experience? I'm trying not to freak myself out.