When should I test exactly

pr

Switched birth controls about a month ago. Went from the pill to the ring. I am 8days late on my period. Have been having little cramps. My boobs are sore and I have been nauseous a little but not much. I’ve taken two first responses tests both negative. Is it possible that since I was on the pill and it was making me have a period every two weeks that I will just skip this one or could I actually be pregnant and when exactly should I test?