In Need Of ADVICE

Hello everyone! I'm Katie and I am 20!August was my first month TTC. I also went off BC in the beginning of august. I use Ovia and Glow to try and calculate when I'm ovulation and such. My AF was due the 11th I believe and still hasn't shown up. I took a test yesterday and it came up BFN. I'm trying to stay positive for next month🤞🏼 but my question is, has anyone been in the similar situation before? Is my AF late because I stopped BC last month? Will my body be more ready to conceive this month then it was last month? (Having gotten off the pill last month)