Hi dear please dont get depressed this ll effect ur unborn cutie. I ll try to explain u. Scabies usually comes from some family member suffering from same. In this the lesions are like small pimples mainly on lower abdomen groin in finger clefts etc. They are very itchy and itching mainly in night. Eczema is usually water filled lesions which ooze. And eczema in pregnancy is highly unlikely. Next is allergy. Itching in allergy keep coming and going it wont stay long. There is another condition called pruritus of pregnancy. This happens only in pregnancy and goes off after delivery. Now i would like u to get just one test done. Get u liver function done. Raised bilirubin levels is one of the important cause of itching in preg. Hope u got an answer and hope u get well soon. Thank u.