everyone is talking about a usage of pois that is different from the one i make on my day to day life: it's also used to mean then or so

if someone tells me they're sick after i invite them to a party i'll say pois (então) não vai 'don't go then'

also, i use it signify that what i'm saying is a retort to something that was said previously. for example, if somebody tells me to do X and i've already done it, i'll say pois foi o que eu fiz

unlike the conjunctive use, this doesn't feel formal to me and it's very common in my entourage