If A Girl Had Sex While Having Her Period Can She Get Pregnant From Pre-com?

If a girl has sex before her period, will she get pregnant?

There are three phases of menstrual cycle

1. Desqumative Phase (Starts when bleeding take place)
   
2. Proliferative phase (Starts after bleeding finished, usually from 7th day of period up to 14th day of period in 28 days cycle)
   
3. Transfermatory or secretary phase.( Starts after ovulation from 15th day to 25th day of period in 28th day cycle.

The pregnancy is possible on 14th day when ovulation takes place. So during periods, no ovulation or egg so no pregnancy.