Line?

Soo. I got off nexplanon over 2 months ago! Been testing negative every month since. Dr told me to take pregnancy test and sent in a prescription for pills to jump start period as well as birth control to regulate me! So if this is a no when should I retest before starting pills? I feel like i saw a hint of something but could also be because i want to be pregnant again! Have had sore boobs and slight random nausea. No other symptoms.