Need Help...

So, I’m 3 months postpartum and I’ve just felt off. I’ve taken a test everyday this week and all have almost non-existent faint lines but visible to me and my husband. We are not trying so I don’t think It’s line eyes either. Anyways none of the rest are getting darker and my period is late by 3 days. Should I call my Ob/gyn and get a blood test or wait it out until next week and test again?