Yes, it is possible but more improbable. It is worth noting that the lengths of both menstrual and ovulation periods vary much from person to person, and from cycle to cycle. When the menstrual period is much longer than normal say more than 7 days, then adding 2-3 days for the life of the sperm gives a total of 10 days into the ovulation time which makes pregnancy possible, but improbable.
A woman can get pregnant right after her period and here is why. Most cycles are 28 days long. The first day of your period is day one. You would ovulate on or around day 14. But if your period lasts longer, like 7 or 8 days, you are then only 4 or 5 days from ovulation. Then there is the fact that sperm can live for up to 5 days in the fallopian tubes. This could make for a pregnancy.