is 33% high for chance to get pregnant

Allison • Baby number 1 on the way ♥️
so I'm 18 trying to concieve with my boyfriend of 3 years now , I don't know if 33% is a high chance of getting pregnant when it says that on my calendar thing? I'm just so worried I won't be able to have kids & I love kids so much & it would break my heart if I couldn't so someone please tell me some things we can do so we can concieve . Thank you