Insects like that are normally detected because of their excretion. Somehow, these craps betray them.
Because bed bugs belong to the insects' family, naturally it follows that they are bonafide insects. Classifying them or grouping them with blood-sucking insects will be logical.
However, be informed that, yes, bed bugs do suck blood, but they are very safe. Unlike mosquitoes, which transmit and transfer diseases form one person to another, bed bugs' bites are not that notorious.
Scientists have found that bed bugs' stomachs have linings and peptides that will not allow bacteria, fungi and viruses to thrive. It may be a consolation for you.
If the question pumps into your head after waking up one morning and feeling several itchy parts all over your body, chances are you have been victimized by bed bugs during the night.