Maintain A Healthy Weight

According to Healthy Women. Org's article, Fertility-Boosting Foods, "Unhealthy food intake - whether too much or too little - has been recognized as a contributing factor to infertility. Too little or too much weight can make your reproductive cycle irregular." 

The article also goes on to say quoting Dietitian,  Maria Biasucci-Vianna, "Ovaries and fat cells regulate estrogen, which affects ovulation. If you are too thin, you may not produce enough estrogen. If you're overweight or obese, you may be producing too much. The first order of business is to achieve and maintain a healthy weight to keep your reproductive cycle in balance."  Maria also advises that women see their BMI scores.

If you're unsure if you're at a healthy weight or not, you can weigh yourself with an at-home scale or public scale that some grocery or wellness stores have. Then to get an estimate on what's good for your height and weight, find your BMI on any online BMI calculator. If your BMI says you're over or underweight, I would make an appointment with the doctor to confirm specifically for you, what range you're in and if it's healthy or not for you specifically.

It continues on to say, "Recently, Harvard School of Public Health published findings of a study where it followed more than 18,000 women for 8 years to see if diets influenced their ability to become pregnant. The study found that women who ate food containing higher amounts of trans fats, animal proteins, and carbohydrates, among other dietary factors, were more likely to have an ovulatory disorder. Ovulation disorders cause about 20% of infertility in women seeking help in becoming pregnant. Researchers feel a majority of cases "may be preventable" by adjusting diet and lifestyle" (Fertility-Boosting Foods).

According to Fit Pregnancy, "The ideal BMI for conception is 20 to 24.9. If bodyweight or body fat is too high or too low, estrogen and progesterone concentrations in the body go down. Adequate estrogen levels are needed to stimulate ovulation. Underweight women can have regular menstrual bleeding, but the cycles are likely to be anovulatory, which means ovulation doesn't occur. Low progesterone levels can affect the luteal phase, the second half of your menstrual cycle. Having a luteal phase disturbance (LPD) means you might ovulate normally and fertilization occurs, but there's not enough time for the fertilized egg to properly implant in your uterus. Getting your period less than 10 days after you ovulate (as determined by an ovulation kit or a blood test) is a red flag for an LPD" (Of Fat and Fertility). To find out your BMI, click on the words:  
Fit Pregnancy's Online BMI Calculator

According to Pregnancy Day By Day, " In an ideal world, you should lose excess weight before conceiving because obesity makes you more prone to diabetes and high blood pressure and means you're more likely to need a cesarean.

A BMI under 19 or over 24 can adversely affect fertility. If you're overweight, excess fat tissue may affect your metabolism and hormones and you may not ovulate as regularly, or at all. If you need fertility treatment, the chances of success are also lower if you're overweight, because you respond less well to the drugs that stimulate ovulation. Once you're pregnant, being overweight can also cause an increased risk of complications, decreasing the chance of carrying the pregnancy to full term."

Bibliography
"Fertility-Boosting Foods." Fertility-Boosting Foods, Foods to Improve Ovulation | HealthyWomen. National Health Women's Center, Inc, 2015. Web. 01 May 2015. <http://www.healthywomen.org/content/article/fertility-boosting-foods>.

"Of Fat and Fertility." Fit Pregnancy. Meredith Corporation, 2015. Web. 01 May 2015. <http://www.fitpregnancy.com/pregnancy/getting-pregnant/fat-and-fertility>. 
Weighing too much--or too little--can make it harder for you to conceive.

MD, Amato, Paula, and Maggie Blott, MB, MS, eds. Pregnancy Day By Day. 1st ed. New York: DK, 2009. Print.