so confused

So lately I saw a post about it being a high possibility to get pregnant from precum, even whilst on the pill...is this true? I started taking the pill today so I thought I'd check <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> for a bit of advice on it..now I'm confused and worried, any advice would be appreciated😬x