Skipped

All my life I've been irregular with my cycles but after having my daughter I've been pretty regular. I usually start around the 26th but never had one for November. I've taken a test but it said negative. I get really nauseous towards the end of day like I did with my daughter. We followed this app to know when I wad ovulating so we're hoping I am. How long should I wait before I take another test? Am I just over thinking it cuz I want to be? The anxiety about this is killing me.