Can I possibly be pregnant? 👶🏽

Michele ❤️👨‍👩‍👧💍
I had my daughter 3 months ago. I had my period October 30th all the way till November 9. I did have sex after I had my period. Probably 2 days after. And I have yet to get my period. I just recently started birth control as well( December 1st)  Should I be worried? When is a good time to take a pregnancy test