Testing twice a day?

Caitlyn

I have read that you should do your test twice a day. Is that true? Also can you have low surge one and and then the next you get a high surge. Glow said that I should have ovulated last week and Premom app says that I am going to be ovulating in 2 days. But my test are all around .20-.24 right now? It’s my first month tracking so I am a newbie thanks for all the help!