Good chance?

Karen • 31 y/o. Married 9-21-13. Baby #1 arrived 9-4-16 after nearly 2 years TTC.
Started spotting/ little brown in discharge today--6 DPO. Originally Glow said AF would come on July 4 but once I received +opk on Monday 6/23, it changed my AF to July 8th. Used Fertilitea up until Fertile week and Musinex during Fertile week. FYI I stopped taking BC in Feb of this year after about 10 years on it. Think
​I have a good chance for a BFP? 4 months TTC.