I just started my period today. When should I try and get pregnant?

When you ovulate. Your "fertile period" refers to 4 to 5 days surrounding your ovulation which tends to occur 12 to14 days before the onset of your period. It is usually not very useful or recommended to calculate your fertile period based on your day 1 of menstruation, even when you have had a regular 28 to 30 day cycle. Ask your gyn to help you tell when you ovulate and go from there.