Wisdom needed! 🙃

I took the pill for 4 & 1/2 years and stopped taking it on June 27th to try to get pregnant. I had my first period on July 15th and it seemed to be like my normal cycle (except for the cramps! 😳). I now am 3 days late. I took a pregnancy test and it was negative. I'm wondering if this could be from the effects my body still trying to regulate or what? Does anyone have any wisdom or have gone threw something similar? Help please!