please help

hh

i had sex after ovulation i think.just 2 time and i missed my period.i checked and i was positive for pregnancy.its my second baby.i went to the doctor she did my blood test urine test and all.she told me its too early and my vitamin D is low so she asked me to take some vitamin D suppliment plus she told me my hormone level is too low have to do another blood test.i did another blood test and she called my husband today and said my hormone level is too low it might lead to miscarriage😔 she asked me to do another blood test just before ultrasound in 1 and half week. it broke me into pieces.i am hiding my tears trying to show im strong.

what should i do? what can i do?

i am so scared please help🙏🏻