Period late and bfn :( advice

So I am 2 days late today with no sign of af on the way at all :s my periods are usually anywhere from 28 to 35 days and that is the absolute longest it has ever been. I have also had heavy watery cm which I get but only around ovulation and it lightens right away until af shows up. I took a pregnancy test today and bfn :( we have been ttc and I am going to see a fertility doctor with my s/o this month. I'm not sure what to think? Is this normal? Or a bad sign? Should I detest or just wait for af to show up? I've had three misscarages too and had signs of pregnancy before af was due so I'm very nervous. Any advice would be greatly appreciated as I am so confused. Tia