I'm more of the line that if your going to miscarry there is not alot you can do if anything to stop it, so with the ones that I have had I've always just gone about my business and done what I had to do, your boyfriend maybe right, you may have passed everything, you may have had a blighted ovum, thats when everything stops developing early, usually before the baby has formed, so before six weeks, the body can still think its pregnant for a times as the placent can grow, it just takes a while for the body to realise that no baby has grown, I would def do as they say regarding seeing an obgyn, if indeed your hcg level was 1300, this is quite low for 8 wks, hopefully everything is progressing and you find that you have a sticky little bean, good luck
Following Dr.s orders I think would be the right thing to do what can it hurt