There are two types of molar pregnancies... Complete and Partial.
A complete molar pregnancy is when a sperm fertilizes an 'empty' egg. In other words, an egg that has no/or inactive nucleus. The sperm ends up making up the missing information through duplication and the pregnancy proceeds as normal minus a baby. There is placenta, sac, HCG hormone etc. but there was never a baby.
A partial molar pregnancy is when two sperm fertilize one egg, as the pregnancy develops (unless it progresses into healthy twins) there are generally partial 'parts' of the pregnancy that are developed. IOW partial placentas, partial sacs. If a baby does develop it generally has a lot of genetic problems.
Most often the cells in these pregnancies develop in grape-like clusters and can be pretty easily detected via ultrasound.
Because of the nature of the pregnancy, your hormone levels will need to be checked every two weeks until you have NO HCG for a period of at least three weeks. Then they continue to check your hormone levels beyond that (to the 6 months) to make sure there is no residual tissue left that is mimicking pregnancy.
I'm so sorry for your loss, and I hope this info was helpful.
