Advice please

I am 34 yo. My husband and I have been trying for 4 months. On Tuesday night I got a very faint line followed by a little darker, but still faint line on Wednesday morning. Had blood drawn and just got the result. Hcg 20. Been having brown spotting for three days, but it seems to have gotten heavier today.. still brown, no red. I want to be excited, but very worried. Anyone else have any experience like this?