Irregular periods and testing?

So my periods are irregular I start my period on the 14th and lasted 6 days. My cycles range from 20-40. I don’t know when I ovulated. I tested on October 5th afternoon pee first response. BFN! I’m having little nausea off and on and headache. Moody here and there. Same as first pregnancy. Should I test again tomorrow in the morning or wait a bit?