2 days late

I’ll start off by saying I’ve never been late... ever. I’m 2 days late which usually I would totally assume I’m pregnant but I had testing done last month at the doctor and they said I didn’t ovulate so they prescribed me clomid. I haven’t started the clomid- I start the 5th day of my cycle which I assumed would be Friday knowing my body but no period yet. I’ve taken 3 pregnancies tests over the last 2 days... 1. Invalid 2. Negative 3. Invalid. So strange!