I have been trying to conceived for the last 4 months, and have been unsuccessful, same reason of stress my periods have been delayed, i had sex on dec 28 but did not get to the point of ejaculating my last period was on dec 22 lasted 4 days then got anot

Do not overdo trying: I suggest monitoring your ovulatory cycles and waiting 2-3 days between intercourse to let your partner's sperm count increase, spending 15-20 minutes on foreplay ( sexual secretions enable sperm mobility during fertile time, sexual postion with your hips elevated on 1-2 pillows and legs resting of partnet's shoulders ( 2-3 minutes) after he ejaculates. Do not "try" too hard-relax.