All ladies TTC- would you buy this if it was available?!?

I have been TTC since Jan with 1 miscarriage. I have spent a small fortune on pregnancy tests and have just had an idea. I dont know if this has already been invented- if it has tell me where i can get it!!! A finger prick test to measure HCG in blood. you know like with people who have diabetes can do a finger prick and measure their blood sugar levels, i think it would be fab if there was a pregnancy equivalant. Dont you agree ladies!!!