am I or????

My last period was August 13th. eve (app) said I would start my period on the 17th of September.. I have yet to start my period but it's only the 30th so that's what 13days??? Of a late period?? Me and my boyfriend are sexually active and we don't use protection. I did notice today that I had this clear discharge and that's a sign of your period coming right? We've already talked and if I do get pregnant well we are keeping the baby but I'm still thinking I'm not pregnant idk I just need advice I'm so lost