Today ii have been cramping and when ii went to the bathroom and there was light brown discharge on my panty liner could this be implantation?

Maybe: If you are due for a period or missed a period, checking a urine pregnancy test will let you know if you're pregnant. If you haven't missed a cycle and are in the middle of your cycle, it could be due to ovulation.

Possibly: Unexpected bleeding could be due to many causes. Implantation bleeding would occur about 5-6 days after ovulation. Other common causes of bleeding are due to mid-cycle estrogen drop, polyps, fibroids, cervical disorders and miscellaneous hormone disorders. Unless they are recurrent, they do not matter too much. Abnormal unexpected bleeding worries women and rightly so. Best wishes.