Girls, when is the best time to take a pregnancy test and is it worth …

Girls, when is the best time to take a pregnancy test and is it worth doing in principle? I think my period will be, but what I tell my friends, they're thinking that they won't have one anymore. Symptoms that worry them: - Went to the bathroom more often - Sharp reaction to some smells - Cold (like some write that they also had cold symptoms for 2-3 days) - Pulling their belly like during menstruation only in a gentle mode and periodically - Sleepiness - Mood swings - Irritability