tought to tell from the pictures. ticks have six legs, and being in the northeast means they're everywhere. Based on the pictures, looks like a dog tick. And it looks engorged...
You should check to see if the head or legs is still in your skin.
It doesn't appear to be a deer tick from the pictures, but you don't want Lyme disease either way. Lyme disease is transfered to the host after >36 hour meal, via saliva from the tick.
http://www.cdc.gov/ticks/
CDC has some good write ups on prevention.
They're everywhere around my area. tick checks are just part of life. Lyme disease is typically transferred by nymphs because you can't feel them on you. I had an adult female tick attach to my arm about 1.5 years ago, hurt like a mofo. And that's why you don't usually get Lyme disease from the adults, because you can feel them. Get them off you before they can start the blood meal, and make sure you get it all out. If the tick is engorged (fat from your blood), seek medical attention. Lyme disease won't be detectable for weeks, but the sooner they give you the meds the better.