People develop kidney stones because: 1  Their small bowel absorbs too much calcium. 2  Their diets are too high in calcium or another mineral. 3  They have intestinal problems.  Urinary tract 1  infections. They may have inherited a certain disorder that makes their bodies more likely to form kidney stones.
1 Delayed ovulation may be a sign of poor egg quality. 2  Even if fertilization occurs, with delayed ovulation the endomtrium (uterine lining) has aged since the beginning of your cycle and may no longer be ready for the implantation of the fertilized egg.
And yes, it's still possible that you're pregnant. In a normal 28-day cycle, your period comes about 14-16 days after ovulation. However, unless you are positive that you know exactly when you ovulated, your result could be off one or two days. If you did ovulate on the 20th of April, that is 15 days ago.