I think I might have bed bugs, but I can't find any signs of them!?

I recently moved into a new apartment. After 3 weeks, I woke up with itchy bug bites, much like mosquito bites. They were originally in a line-like pattern, but then became more scattered. I instantly thought bed bugs and began a search for them like no other. I looked EVERYWHERE, on the mattress, under it, in the carpet, on the box spring, on my headboard, on my sheets and pillows, and I cannot find one single shred of evidence! My boyfriend has not been bit at all, but I have around 12 now. What could this be?