It is hard to determine without being able to see the bite. Have you any idea if it was a spider?
Do you have any of these symptoms?
* burning, pain, itching, or redness at the site which is usually delayed and may develop within several hours or days of the bite
* a deep blue or purple area around the bite, surrounded by a whitish ring and large red outer ring similar to a "bulls eye"
* an ulcer or blister that turns black
* headache, body aches
* rash
* fever
* nausea or vomiting