OK, lets talk about pregnancy and precum. Men can have precum during any time of sexual activity. ANY TIME. That means, even if you only had sex for a fraction of a second, there could be enough precum to get you pregnant(that he would have no idea was there). Condoms and birth control are VERY VERY important.

Plan B is not meant to be used as birth control. It is mean to use only in emergency situations where there has been some accident or birth control failure (condom breakage). Not as something you depend on to prevent pregnancy.

If you read the insert in your Plan B pill package, it will tell you that your period can be messed up for up to 4 months following taking the pills. They are a massive dose of hormones and they can affect your cycle. Just because they didn't affect you the first time you took them doesn't mean they won't now.

Why aren't you on birth control? Planned Parenthood gives free and discount birth control and condoms are FREE. There is no reason not to protect yourself.

Take a pregnancy test if you suspect pregnancy.