I did still want to comment on the rest of the post:
You took Plan B because people recommended it to you? I am sorry but these people are completely incapable of giving medical advice and I highly recommend not relying on them in the future. Plan B is not meant to be used as a failsafe. It’s very irresponsible.
You did not need plan B. It’s a huge amount of hormones that should only be used in case of an emergency. Hence we call it emergency contraception. Plan B can affect your body for weeks or even months, and you’re still getting used to the pill so you can definitely expect some side effects in the coming time because your hormones are going to be all over the place.
Emergency contraceptive also does not work on any of the sex you have after it, it is not a replacement for birth control. So if you were in fact unprotected, you’d need another one since you had sex after and the condom broke. But you were protected by your pill already. Make sure to do some research on your pill by reading its pamphlet and if you use online information make sure they are backed up by scientific research. NHS and government health websites are a good source for this.
Condoms breaking is often a sign they are the wrong size, so look into that. I would recommend to keep using condoms for the foreseeable future so you can learn to trust your pill first.