Pregnant with no positive test?

Deanna • Queensland. Hubby and I have been trying to conceive for just over a year. Married for 2, together for 4 years total
Just wondering if there are any ladies here that have been pregnant without getting a positive frer? My average cycle is 28 days and now up to 30. So my period is two days late by average (glow said due 4 days ago, ovia 2 days ago) and still no sign of AF but tests were negative. Help!!