Toward the end of this week, one of the eggs in your ovaries is likely to have reached full maturity. Ovulation occurs as the egg, under the influence of hormones, bursts out of its follicle. If it meets a sperm, you may become pregnant. Now is the time to enjoy lots of sex with your partner, so go for it-as often as you like. If you have any anxieties about fertility, try to put them aside and relax.