ovulation tests....help?

Morgan • 1 molar pregnancy 1/1/17, 1 beautiful baby boy 1/14/18, one blighted ovum 9/21/18. Pregnant with baby#2 10/20/2019
On to cycle #5 TTC. This will be my first month using ovulation tests. Just wondering what day of my cycle to start testing and if you guys test once or twice a day? Etc