Ob-Gyn questions? Ask a gynecologist online.
This is Dr. David
In 85% of normal pregnancies, the hCG level will double every 48 – 72 hours
it sounds like your bHCG levels are doubling properly.
it can be normal to have some mild spotting early in pregnancy.
it sounds like you are worried about loosing your baby.
what questions do you have?
it is ok that the gestational sack measures 4 weeks.
that is ok. it will continue to grow with development.
you should be on prenatal vitamins.
and not drinking and not smoking.
have you been improving your diet and nutrition intake?