Please help

Brandi

So I have a question for any ladies with a serious answer. I had an iud and got it taken out a couple months ago and had a period the day after it was removed. My fiancé and I are trying for a baby. I am now 27 days late for my period and I’ve taken at least 10 tests and they’ve all been negative. I have the symptoms of being pregnant but not getting any results. I went to my dr for a test two weeks ago and she said to come back in April if things are still the same. Does anyone know what it could be that’s causing a negative testing but late period? Keep in mind my periods have always been spot on or within a week of the start date.