Hi Tasneem! how are you? Anyway; i think that your sentence is correct! and i wanna just share some examples with you to give a better understanding!
1-since as an adverb means from a particular time in the past until a later time, or until now
*Tasneem went to work in New York a year ago, and we haven't seen her since.
*He started working for the company when he left school, and has been there ever since (= and is still there) .
*I've long since (= long ago) forgotten any Latin I ever learned.
2-since as a preposition from a particular time in the past until a later time, or until now
*England have not won the World Cup in football since 1966.
*It was the hottest October since records began.
3-since as a conjunction means because; as
*Since we've got a few minutes to wait for the train, let's have a cup of coffee.
4-since as a conjunction of TIME means from a particular time in the past until a later time, or until now
I've been very busy since I came back from holiday.
And i finally i hope that i've answered the question well!