I am 5 weeks pregnant. I took HCG test on 32 day and it came out 483(normally my cycle is 32 days). My Oby Gyn said that HCG is low. Please help me more details regarding HCg levels in early pregancy.

There is a wide range in hcg levels so a single reading doesn't give a great deal of information. A reading of 483 is within the range for being 5 weeks pregnant. It would be more important for your doctor to take another reading in 2-3 days and see what the results are.