Congratulations on your most recent test!
I had a quick read about bartholins cyst and it doesn't seem to relate to pregnancy in any way. However, if you think the blood may be from that it's probably a good idea to see a doctor about it as they can sometimes become infected. They can apparently be caused by the bacteria e.coli, which is also usually responsible for UTIs, although I don't know if it would be the same strain, but thought it may be worth mentioning in case you have any symptoms x