5 days late

Katie
Been trying now for 6 months after miscarriage. Every month I pray, every month AF. I track my ovulation n periods I am definitely 5 days late 12 days dpo. I rushed n took a cheap Walmart test on the day I should have started, BFN. But I know I took the test too early. I'm also have a lot of thick sticky CM, and light cramping today...what do you ladies think does it sound good? N how much longer should I wait to test again?