Is beta hcg of 587.6 for 4 weeks good?

We have been ttc since Nov 07 and we actually got pregnant Dec 08, but had a missed MC at 11.5 weeks. We started the IUI process this past Oct--didn't take...I went in for a follicle scan in Nov and Dr didn't see follicle large enough and saw a collapsed follicle--(ovulated early) didn't get to do IUI--I thought this month chances were over, but when I asked Dr he said He missed it (follicle)--but my husband may have gotten It! :D We found out last week--He Did!!! :D We got a +++! Progesterone on day 23 of cycle was 33.6 and I found out on day 26 hpt +! I went yesterday for my first beta and go back in the morning to see if it will double---Please pray that it does!!! Baby Dust to ALL! What is normal? My missed AF was Oct 21, but conceived Oct 31 or NOv 1?