Need some advice....

So I tried catching my ovulation with a kit Last month and never got a positive. Then I had a lot of pressure on my uterus for like a week after I would have ovulated.....I'm three days late and I've taken 3 test that are negative. Do you think there's still hope of being pregnant?!  I feel like I'm beating a dead horse but I'm kind of confused. My period is always very regular.