The older that such fish become, the more mercury they may have absorbed. Anything that eats these fish within the food chain also consumes the higher level of mercury that the fish have accumulated. This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher
The goal, then, when it comes to having a boy is to increase the likelihood that a Y chromosome sperm reaches the egg first. Many medical researchers believe that Y chromosome sperm are faster swimmers, but that X chromosome sperm have more endurance.
Tracking Your Most Fertile Days. Generally, the highest chance of pregnancy is when sex happens1-2 days before ovulation. If you have a regular 28-day cycle, count back 14 days from when you expect your next period to start.Plan on having sex every other day around that time -- say, days 12 and 14.Keep in mind that having sex every day may lower a man's sperm count.f you're overweight or obese, losing weight can boost your fertility and chances of getting pregnant. According to the American Society for Reproductive Medicine, a drop in weight of 5%-10% can dramatically improve ovulation and pregnancy rates.