Could I have bed bugs with absolutely NO signs of them?

Ok, so for about the past 6 months, I wake up roughly once a week with between 3 to 10 bites, on my torso, upper legs and arms. I have moved apartments and had these occur at both places. I have thoroughly inspected my mattress and bedroom and couch many times with a flashlight and have not seen any sign of bedbugs (bloodstains, feces, or the bugs themselves). Recently I bought climb-up interceptors for the legs of the bed and washed and dried all the linens. I moved the bed away from the walls and tucked in the sheets. I thought they were gone as I had no bites for almost two weeks, and then woke this morning with 4 new bites. I don't feel the bites at night but I am pretty sure that is when I get them. They are extremely itchy and vary in size, although they are usually clustered together. Can it be bedbugs if there is no trace of them after 6 months? Wouldn't there be a majorly visible infestation at this point? What else could it be? Please help this is driving me crazy!