"had unprotected intercouse on day 16 of my 28 day cycle. took ella 2 days later. experienced mild stomachache for about an hour after, a bit of dizziness but not much else. period came 1 day late, with no other symptoms. highly recommend it, had way less secondary effects than with levonelle which made my period 4 days+ late and gave me horrible cramps. good luck and don&#039;t stress too much!"