It is normal to have semen at the tip of the penis after intercourse. The normal concentration of sperm is about 15-20 million per cc semen. As long as your husband is able to ejaculate into your vagina and his semen volume and counts are normal there should be no concern regarding sperm entering or reaching its appropriate destination. Few drops of semen seen few hours after intercourse is also normal and should not be a cause for concern. You and your husband should be evaluated for infertility by a urologist and a gynecologist if it has been more than a year of every other day intercourse around your time of ovulation.