I'm 3 weeks and 3 days according to glow!!!

Letty
So my doctor confirm my pregnancy she send me to do a sonogram to check if the baby is ok and how many weeks ... After my MC on Nov later I got my period for 8 days  on Dec 29 until Jan 5 then by after a few weeks a I got my period again but this time for only 3 days Feb 2 until feb4 ... Then a few weeks later I took a test and it was positive ... Went to my doctor and she confirm my pregnancy ... My HCG levels on March 5 was 142 ... You guys think that's normal ... I heard her saying to the sonogram lady I was 5 weeks ... I don't know if my levels are low ... I'm a little scared because because I don't want to lose my baby ....