Am I out this month or too early to test?

This is me and my hubby’s first cycle TTC. I am currently 7dpo. I ovulated on August 28 with the surge the day before, and we baby danced the 24th, 26th and 28th. I have been having so cramps since ovulation and back pain. The cramps aren’t painful, they’re dull but you can tell they’re there. My app says I’m due to start my period on Saturday. I took an internet cheapie this morning and got a bfn. I’m going to keep testing with internet cheapies until or if I don’t start my period. What do y’all think ?