My period started n 2nd january, 2013 and lasted about 5/6 days. on the 14 of jan after my workout there was a big spot of blood on my panty.am i preg?

Not if your: Cycle has been regular. Mid cycle bleeding is not indicative of pregnancy because if u started on jan 2, ovulation would be on the 16th. Not to say u could not be, check a test, may have been pregnant longer but not from this cycle, as described. Depending on your age it makes a difference in management. If over 35 we would do an evaluation, if on the pill, that makes a difference.