a side effect from the Plan B, or is it actual spotting from the start of a pregnancy if there is blood as well? My boyfriend did not actually finish, it was only precum and I took a Plan B about 72 hours later. I have not had any other symptoms or side effects of pregnancy except the possible spotting. I know being extremely stressed can cause your period to come late. It is supposed to come within 2 or 3 days, but with the stress I've had it could come later. I cannot stop worrying and freaking out that it could be spotting with the regular blood mixed in. Someone please help!!