First of all, taking femilon
tab as OCP
is quite effective in preventing unwanted pregnancy
(more than 99%).
Second thing, unprotected sex prior to commence of period is very much safe and chance of pregnancy is almost nil literally.
Your period is delayed due to taking additional pill on 3rd March and causes hormonal
imbalance. You get withdrawal bleeding,same to period within 7 days possibly.
After 7 days, if you do not get your period, you need to contact with gynecologist for relevant investigation & suggestive measures.
Avoid stress/ tension, take healthy diet with Vitamin & iron supplements
, control body wt by regular physical exercise and take sound sleep.