When should i test

So i had my normal cycle on birth control and my hubby and I decided to start trying my period was lighter than normal (usually i use pads or tampons, didn’t have to this time). Got off birth control had another period about 4-5 days later still super faint was more like a pinkish color. I have 3 weeks before my next period. When should i test 🤷‍♀️