emergency contraception
"It happened last day before my period. Technically it's impossible to get pregnant in that period of the cycle, however every person is unique and may be a lot of exceptions. I took the pill ~40h after as I hoped period to start itself. After 24h felt nausea and was afraid that my body rejected it. Nevertheless, my period started 5 days later. I assume its delay was reasoned by the cold I got that month earlier and medicine I cured myself and eventually by that huge dose of hormone the morning pill consists of. The next period came right on time regarding the new cycle.
Insist on using condoms!"