not sure how far along maybe three or four weeks and I started a period
An hCG blood level above 25 usually means that you are pregnant, but if you got your period then you may not be pregnant anymore. If you do another blood hcG test then you should know. If it goes up normally then your pregnancy is fine.
Actually, anything over 5 means your pregnant except in rare cases in which there are other medical reasons. You can have bleeding while pregnant and be okay. Or it could be an early miscarriage. You should ask your dr. to take your hcg level again to make sure it's going up instead of down.