Mini pill & plan b?

Ok imma start off I’m super paranoid I’ve been on the mini pill for about a year now but I haven’t been sexually active for almost three since I had my first child. Well I recently causally hooked up with this guy I agreed to no condom eventually. On my way home which was about four hours later I took the plan b just in case but I’ve been nauseous cramping and had a migraine every since. This is my first time taking plan b so is this normal? I took the plan b on feb 7th and its now the 13th I’ve also been still taking my daily mini pill.