Do a quick tick check if it's above freezing. It's going to be in the 50s later this week. Ticks take a while to really latch on and take your blood. If it's just on you, pull it off with tweezers and make sure you get the head if it's attached. If it's full of blood (full as a tick...) I would get the prescription stuff, but it takes a long time for the tick to get to that point, over 8 hours I'm sure.