Harder to conceive baby #2???

Did anyone get pregnant easily or without trying with baby #1 and now with baby #2 having a harder time? We got pregnant using pull out method with my first. We are now TTC #2, BDing every day, <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> with CBDOT. I was certain I was pregnant this month and then today AF showed up. Frustrating!!! 😭 Thanks for your feedback.