AF due 6/9, BFN 6/10, Anyone wanna be cycle buddies?

Hi, my name is Marie-Elana, I'm 25 yes old and been TTC for 3 months with my fiancé, we are getting Married in October 2015! My cycles up until 2009 were irregular and sometimes non existent for months at a time. Then I got pregnant with my first son who is now 5. I went on Mirena for 4 years, had it removed end of June 2014. Cycles did not return to normal until February 2015. I was only Marking on a calender then but when I noticed that it came back again same time in March I started getting my hopes up that my cycle had returned to normal. My period give or take a few days is always the week of the the 16th and periods last 4-5 days long starting heavy then getting lighter. I was using Ovia Fertility at first, then found Glow. In May when my period ended on the 15th, my fertile window was from the 22-27, according to Ovia. But an online calculator said it was from the 21st-26th. Said I ovulated on the 26th, fiancé and I had intercourse on the 25&26. Not sure of how good my chances were but as of late I have head cramping, bloating, headaches, nausea, gas and even some pink or brown spotting. I took a hpt on 6/10, it was a bfn. Few friends told me to wait another week and try again. I suppose today I would be 16dpo but I'm not entirely sure. So...there's some insight on me...anyone wanna be cycle buddies? :)