In general, cholesterol in eggs has little to no effect on your blood cholesterol levels. There have been some studies that have indicated eggs where the yolk gets oxidized are not as good for you as ones where they don't, but that's not entirely settled. Eating eggs multiple times a week is very unlikely to be a problem for you, but as always, when you're worried about something, check with your doctor.
As to the potential hijack, chickens are birds, and thus the females have one orifice in their lower anatomy: the cloaca
. This serves for the outlet of urination, defecation, and egg laying. This is why you should wash eggs before either cooking them or cracking them open.