Negative pregnancy test but AF is 3 days late

Elaine.
I've been trying to conceive for 6 months after an early miscarriage last year. For the last 6 months my cycle has been 30 days. I am now on day 33 and no sign of AF. I got a negative pregnancy test on day 28 and day 30 but it wasn't FMU? Unsure if just a lon cycle?