Question about my miscarriage..

Since I was only 3/4 weeks pregnant, would I bleed at all?? I've only had light spotting. No cramps or heavy bleeding. I have had two ultrasounds done and everything looked good, except of course they couldn't see anything cause of how early I was.. my levels dropped tremendously.. it was 200 when I found out I was pregnant.. and went back to get them checked last night, and they are 100 now.. soo I was pregnant a while and didn't know till Sunday night :( is it possible that I won't feel anything or see much, just the spotting??