Took birth control pill…having brown discharge with cramps and no periods

Chetna

I had unprotected sex on 21 January after that i

took unwanted 72 on 23 January…now since 9

February i am saying few brown discharge like 1

drop in a whole day my periods date was 10

February, i took pregnancy test on 10th February

it was negative Today also i did another test it is

also negative but I did not get my periods please

anyone can suggest what i will go i am too

worried.

Please help me.