PLEASE HELP!

Do bed bugs bite numerous times? I have a red don't on my hip (which also looks like a swollen ingrown hair) but only one... That's it. 
I opened a pack of Walmart underwear and inside was one beetle looking bug. 
As I look up pictures of bed bugs, it really doesn't look like one.. I threw them away. 
I looked in our bed in our kids' beds everywhere and have found NO evidence of bed bugs... What do you think? 
Also idk where to post this so please just help me out.