When should I test?

Valerie • 👸🏽 Mama to Nikki James 👦🏽 (born 03-25-08) & Zoe Jane 👶🏽 (born 06-13-2016)
Had a positive OPK on April 20th & Glow predicts my AF will start on May 5th but my cycles have been so irregular since I got off BC in December. It's hard to wait for a "missed" period in order to take a HPT! I don't wanna jump the gun & get a bunch of BFNs... What would you do??