Consuming foods and beverages high in caffeine should be done in moderation during preconception and pregnancy. Rachel Engelhart, MA, RD, LPC, told POPSUGAR: "Women trying to get pregnant should consider limiting their coffee intake to 200 mg or less (i.e. 6 to 8 ounces of coffee) per day. There is some conflicting information around this, but most healthcare specialists recommend avoiding excessive amounts of caffeine to circumvent any adverse effects on fertility."