Cycle on 2/13 only 4days;intercourse 2/21 w/husband.pink discharge on 3/2 and then brown on 3/3.tired,gassy,emotional. could i be pregnan?

Do a pregnancy test: If you cycle started on 2/13, then 2/21 would have been Day 9 of your cycle and was probably prior to your ovulation, but it is close; so pregnancy is currently a possibility, and the pink discharge on 3/2 could have been implantation bleeding/spotting. Because you may be pregnant, be sure that you are taking Prenatal Vitamins with at 1 mg of Folic acid every day to help prevent birth defects.

Seems unlikely but..: Would do pregnancy test anyway to be sure.

Sure!: If you are not on birth control or using intact condoms, you can get pregnant any time. Check a pregnancy test and see. If negative and the next period is abnormal, see a doc.