Could I possibly be pregnant??

So AF was supposed to come on Thursday 3/19 and still nothing. Monday 3/16 I went to Dr for a foot injury and they gave me a pregnancy test before my X-rays. It came back negative. So yesterday  3/21 after my missed period I took a test again still negative. I have never been late except with my previous pregnancies (both miscarriages) is there still a chance I could be pregnant just very early in the pregnancy? I ovulated on March 5th according to a ovulation predictor kit. Please any advice would be so helpful. I wish AF would just come or a BFP so I don't get my hopes up too high 😟. Anyone have this happen to them and still got pregnant??