Ttc...weird cyles, what is happening?

My husband and i have been ttc for 4 months now. Lst mnth we decided to just let nature takes it course, bt my lst 3 cycles have been very irregular. The first ws on time bt very drk, the second one 6 days late and very bright almost orange, it strtd off lite then to medium flow (sorry for tmi) this cycle is now 3 days late i usually have a normal 28 day cycle, my question is should i start expecting my period around day 34 like it ws lst mnth or should i be worried about mre serious issues. I havent takn a preg test because i knw it will be negative. I have been cramping like it is coming on, same as lst mnth. Im just so confused, i wonder why now tht i wnt a baby so badly my cycles are beggining to become irregular. Any ideas on wht may be going on... Baby dust to all...