Hello. I had unprotected sex October 26th (last month) after I started my period a couple days earlier on the 23rd of October. My partner ejaculated inside me at the time we had sex. I was still finishing up my period at the time as well. About an hour an a half later after he ejaculated inside me him and I went to the store and I took Plan B. Then a week afer that I started back up my birth control pills. Now it's November 24th and my period is a day late. Could I be pregnant? I took a pregnancy test and the result was negative, but I don't know if I took the test too soon. Any advice would be appreciated.

Thanks!