I took plan b on feb 7. For a whole week I experienced extreme nausea and was really light headed/pressure. The following week the nausea went away but have pressure headaches and chest pains as well. I got my period a few days ago it was really heavy. Still experiencing the pressure in my head/dizziness. Took pregnancy test. Not sick. No heart problems. Could this still be from the plan b???? Some one said it could be hormonal....