Girls good day, I'm late by 17 days, the test shows 2 stripes and not …

Girls good day, I'm late by 17 days, the test shows 2 stripes and not one, went for an ultrasound they confirmed pregnancy at a very early stage, this evening I started like my period, bought another test again two stripes. What's going on? ?‍♀️It was different with my first child...