Question about period please loads of answers I need advice ha?

Well I had light spotting 3 weeks after my last period then a week after that I took a preg test they were negative so I umed nothing of it. My periods are never on time there either really early or really late any ways I have had reali sensitive for the last week and discharge and minor cramps but NOTHING is happening? Do you think it could be because I had light spotting last month? Abd it's made my body clock a bit weird what do you think!??