I started my period on the march 21st and me and my boyfriend had sex the 21st and 22nd and he did not pull out. could i be pregnant ?

Unlikely: If you had intercourse on days 1 and 2 of your menses, it is unlikely to result in pregnancy. Women typically ovulate mid-cycle and it is during this time that pregnancy is most likely. That being said, pregnancy can result anytime unprotected intercourse occurs. If pregnancy is not desired, some form of birth control should be employed.

No : You could not conceive that early in the cycle. If you did indeed start a period on march 21, then you were safe.