When should I test?

El

I’m 10dpo when should I test?

I had a BFN yesterday but think it might have been too soon even though it was with an early response test. I was so disappointed so want to make sure next time I test it’s accurate.

I have achey boob, sore nipples which look darker, really bad nausea (at the moment) and creamy/watery CM.

I’ve ovulated for the first time since TTC this cycle on metformin so really think I’m in with a chance of getting my BFP!