What Causes Spotting After Taking Meprate Tablet?

Dear Doctor,

My age - 33, wt - 63 kgs, ht -5 ft 5 inches. Due to a holiday planned, i had consumed a pack of Yasmin (drospirenone) tablets from around 22nd august to 14th september..15th sept i got my periods as usual. i strted second pack from 19th sept to 14th october..15th oct i got my periods..aftr tat i did not continue on Yasmin since my holiday was indefinitely postponed..till 6th november ie 2 days back, i did not see any withdrawal bleeding. Now my holiday is fixed between 15th nov to 19th Nov. 15th is my date of periods. last 2 days i consumed meprate 10 mg OD to postpone the periods. I noticed a bit of spotting today morning after having meprate for the first time. Wat should i do ? should i continue on meprate? i need to postpone cycle till 19th..will this also serve a purpose of contraception ?

Thanks and regards,