Itchy red bites - bed bugs? In the past?

Since Sunday I have been sleeping in my mother's room and bed with her. On Monday morning when I woke up I found myself itching my left upper thigh. When I looked at it, I realized that there were 2 itchy red bumps and as I had scratched a bit too much so small red spots also were there (these have since gone away). A few minutes later I realized I have 1 similar red bump like that on the back of my left knee and on my left arm too. Both itchy, and all looking the same. I resisted itching and put caladryl which has been helpful with the itching and helping to improve them. Today, I was scratching my back on my chair and saw 2 more similar red bumps on my back. Have been applying caladryl similarly. What could this be? Is it a bite of some insect? Or bedbugs? As my bed is main thing that has changed recently - but none of my parents have ever faced this issue in the past? Please advise thanks.