Yes, within 24 to 36 hours of ovulation. Fertilization should occur within 24 hours of ovulation for the best chance of conceiving. If you are looking to conceive and are having difficulties...I would recommend #1) Purchase and read Dr. Richard Marr's Fertility Book #2) See a physician who specializes in fertility.
It is possible. You need to check with your health care provider though before you treat it....in case your preggers.
We buy white and whole wheat. The white always molds faster. I do get more time out of the breads when I put them in the fridge.