anxiety about kids

i’ve taken plan b after sex but it was during my “fertile days” i think. i have anxiety anyways and yes i know i should get on birth control and i am working on that for next month. if anyone could help soothe my anxiety because i worry too much and i am not very knowledgeable, i would really appreciate it. is plan b reliable in an emergency? yes, i know it should not be used as regular birth control, i’ve read that many times.