How best to avoid mistimed pregnancy or unwanted pregnancy after an act / acts of unprotected sex??

How best to avoid mistimed pregnancy or unwanted pregnancy after an act / acts of unprotected sex?? Follow the followings instructions  from Dr. S K Pal(senior gynecologist) for near 100% efficacy in  emergency pregnancy prevention in emergent situation. What are then the  Tips ?

 Tip-No. 1. Sooner the emergency tablet are taken more is the efficacy. Is most effective when used within 12 hours of unprotected intercourse or contraceptive accident..

Tip No. 2. Don’t get worried if there is delay in initiation of next periods:--Changes in menstrual bleeding patterns are common following use of high dose progesterone only pills (I-Pill, Pill-72, Unwanted-72).  Therefore, women who use this method should be counseled to expect such changes. They may experience spotting a few days after taking the pills or they may find that their taking the pills or they may find that their next menstrual period is earlier, later, lighter, or heavier than usual. Delay in menstruation for more than 7 days is of clinical concern; the possibility of pregnancy should be considered. In case of high dose progesterone only pills (I-Pill, Unwanted-72) as many as 87% of women had their next menstrual period at the expected time or within 7 days of the expected time . Whereas 13% have a delay exceeding 7 days. Doctors or Health Care Providers should make her aware that menstrual bleeding after intake of emergency pills may be 7 days earlier or seven days later than the expected date the women concerned should be briefed ahead about such delay to avoid her anxiety. Emergency copper containing IUD insertion, which must be done by a health care provider, can be effective within five days of unprotected intercourse. Someone have noticed that such device do work even if such device placed as late as 7 days after unprotected sex. Copper IUD is the most effective post coital contraceptive.

Tip No, 3. Periods follows after intake of EC tablets will usually be scanty-No worry:-So far as amount of bleeding that follows after ingestion of ECP most women experienced vaginal bleeding that was similar to their normal menses, but 11% to 14% bled more than usual .( Advices of Dr. Prof. Srimanta Pal) -contd.

.