Am I pregnant?

So last month I was taking the pill form of birth control, and then after my period came I stop taking them.. After my period was over me and partner had sex, and he said that he came in me.. so it’s been 3 weeks now, my period is 4 days late. and I’ve taken 2 family dollar pregnancy test and they both say negative. Is there a possibility I could be pregnant? Should I wait another week to take another pregnancy test? 😓