1. no plan b is only good for that one time.
2. contact an ob/gyn and ask.
3. anytime you have sex you run a chance of getting pregnant. whether you use plan b, condoms or not. b/c is NOT 100% effective. the only thing that is, is abstainance.
4. no. you must wait AT LEAST 14 days after the sexual encounter to get an accurate hpt result.
you shouldn't use plan B as a form of BC. You need to see your doctor and get some type of BC.
and megs is right. plan b was not meant to be used as a regular form of b/c. if you continuously use it as such it can lead to lasting damages to the reproductive organs. if you're not pregnant GET ON RELIABLE B/C and use condoms!!!