Late period

Sydney

My period is 6 days late and no sign of coming but I’m not getting a positive pregnancy test either. I’ve been super tired the past week, sore boobs off and on, I’ve also been more gassy, bloated, and nauseous today. 😅 I’ve took like 12 pregnancy tests and none positive. Only two had evap lines and one evap line had color but of corse it was outside the recommended time to look at test.

So my question is has anyone had this happen and still be pregnant and have a healthy pregnancy?