Question???

I have a general question been waiting for my period to come which usually comes like clockwork was supposed to get it on January 26th took tests which came back negative today after 38 days of waiting I may have started my period but it’s just really light like barely on the pad and mostly when I wipe and considering my first days are really heavy how long should I wait to take another pregnancy test should I worry I might be pregnant does anyone have an idea I’d like some advice if I just consider it to be my period