Faint line still

Hi I am 16 DPO and 1 day after my missed period I’ve gotten multiple faint lines and another today a faint line a littler darker than others I’ve had but not much. I’ve already missed my period and I would expect my lines to be darker by now. Should I be worried? Should I get an ultrasound as soon as I can after 5 weeks when their is a heartbeat? Should I test again next week to see if it is darker? I don’t want to have a miscarriage if I am definitely pregnant. Should I go get a blood test done? What should I do??? Any opinions??? I might have ovulated a couple days after my expected ovulation.