Are you less fertile 4 days before period?

Yes, fertility typically declines in the days leading up to menstruation. Ovulation usually occurs about 14 days before the start of a period, and the fertile window is generally considered to be a few days before and after ovulation. By four days before the period, the chances of conception are lower since the egg has likely already been released and is no longer viable. However, individual cycles can vary, so it's important to consider personal patterns.