Newly mated male & female bed bugs
Bugs fed and then mated soon after, then 48 hours passed before picture was taken. Male on left, female on right. Sometimes they are together, sometimes apart. Close-up of female shows newly deposited egg on right and waste dropping on left. Note that dropping is pale because it is nitrogenous waste, uric acid, and not digested blood. Even unfed first instar nymphs deposit pale droppings. There are times when the bug will void dark liquid or undigested blood very soon after feeding - possibly if it has taken in a large volume of blood and has to release some. 1/4 inch squares.