We have been trying to have a baby for past 4-5 months but are failing to do so. whenever we have daily intercourse between 11-15th day of cycle, my periods get delayed for like 3-4 days. can you please guide accordingly.

The usual routine...: Meet someone nice, date a while, get engaged, get married, relax, start having sex once or twice a day during the fertile days, and hopefully get pregnant soon. The fertile days are about days 10-15 in a 28-day cycle. If a couple has sex every one or two days the whole month, they don't have to think about fertile days. If not pregnant after 8-9 months, can ask Ob-Gyn for help.