In oct & nov my period started on the 8. in dec it was 6 days late, jan it didn't start until the 22nd& only lasted 3 days. test neg. could i be preg?

Always possible: It is likely this is just a hormone imbalance, but sometimes pregnancy tests will turn positive later than normal. If you are not wanting a baby, use condoms until you have your next period. I would consider a oral contraceptive as well. See your doctor for that. If you want a baby, just keep trying until you have a pos test. Good luck.