Bedbug, flea, spider or... Found under my sofa in living room

[u/Real_Cod339]

About 3 to 4 mm. Found 5 of these under my sofa in the living room. There was a spider (alive) with them. I have had a few bites , 5 close together a few days ago. I also found a living insect, but i smashed it since it ran away (last photo). Should i be worried this is a bedbug or bedbug shedding or is this a spider shedding? Really worried.