When to take a pregnancy test

Katielee

So I got back home from seeing my fiancé on Tuesday and I was suppose to start my period on the 24 and I didn’t start my period and I usually can feel signs on my period coming but I haven’t yet the first night I stayed with him when I got to where he was we had sex and I took a plan b after but then we had sex the day after and I didn’t take a plan b when should I take a pregnancy test if I don’t start my period soon?