Plan B is a pill you take after having unprotected sex, it is supposed to stop you from ovulating for a few days so the sperm can't meet an egg, it is not an abortion pill so it is not 100% effective. Plan B is not a form of birth control, if that is what you are looking for you need to go get some from your doctor.
To answer your question, yes, you could be pregnant.
You need to educate yourself on the matter if you are going to continue having sex.
yes you can be pregnant after taking plan b
he doesnt have to put a condom on at the end for you to get pregnant. theres no point in him having it on at all if hes just going to put it on at the end.
you can get pregnant when a guy pulls out
you can get pregnant from precum
plan b does not protect you from period to period thats not how it works.
read the instructions
you sound confused when it comes to anything havin to do with sex so i would recomend condoms (from start to finish) and birth control