Confused? Late Late Late Period!

Ja
I have been regular all my life up until last month. I am 31, we only just started TTC, I had mirena out in October and we wanted to wait a few months for my body to get back to normal which it did, and took no time at all. I am currently on cycle day 40, took a pregnancy test on Sunday the 12th. It was negative, no faint lines, a blatant negative. But still no period as of yet and I'm starting to get a little concerned. I have sore breasts, and a tender right overy or around that area. But no moodiness, sickness etc, Anyone ever experience this?? Suggestions are welcome!