Some believe that getting closer to the cervix during sex makes it easier for sperm to swim to their target. “We tell our patients the best positions for conception are the ones that are most comfortable for the woman,” say The Mommy Docs Allison Hill, MD; Yvonne Bohn, MD; and Alane Park, 10 Surprising Fertility Facts. These are the best sex positions for getting pregnant Ovulation usually happens about 10 to 16 days before the start of your next period, so it. Many couples worry about sex during pregnancy. than a face to face position, it can be more comfortable for a pregnant mum -to-be. Share on.