12 days late!

So I'm 12 days late on my period, I had spotting in place of it actually. And spotting as in not even enough to fill a liner. I'm currently on cycle day 46 which is unusually long considering my 28-30 day cycles I've been having. I took a few pregnancy test and they all came back negative. I'm trying to conceive and it's so frustrating! Anyone else in the same???