Are bed bugs pinkish orange looking?

They are actuallly reddish-brown in colour. Though if somebody sees one in or near their bed they might well describe it as looking pinkish orange which is not very different in colour from "reddish-brown". Look for them in your mattress seams as that is usually their favourite daytime hiding place after adopting a bed and its occupant(s) as their food source.

The major tip in recognising a bed bug is it will look very flat and about size of an Apple pip (or smaller if it is a nymph), if it has not had a meal over past day or two. But if it has recently fed, perhaps having a meal of your blood when you were fast asleep in your bed last night, it will then appear swollen looking a bit like a ladybug and its colour will then look redder than when it was unfed.

Some people have no reaction to being bedbugs' meals for week after week, while others who are allergic to the chemical it injects into them before feeding can, after just one bite, come out in very nasty looking lacerations or some in red spots or some in small red marks on the bit of the skin it pierced while they were asleep, some people getting maddening itching after bedbug bites some not.