Totally confused

Ok so I we are on our second cycle of TTC. The first month I started tracking my period was June. I got my period on June 19th and then in July I got my period on July 22nd which would put my cycle at about 33 days and make my next period due on August 24th. Ok so I'm at work now and I went to the bathroom and I'm lightly bleeding and now I'm upset because I'm like ok I guess this is my period 5 whole days early. I kind of thought it was coming because I've been cramping all week and my back has been and still is killing me. I guess I'll know if the flow picks up what exactly it is. What do you guys think? Has anyone experienced this as a pregnancy sign?