Am i making a mistake?

me and my SO are currently ttc baby number 2. sometimes i feel like I'm making a bad desicion like i shouldn't try to have another baby because i feel like I'm not doing good with my son (before anyone says anything though he is well taken care of. food to eat roof over his head lots of love and affection, i have a super strong support system so it's not like he is going without). it's just a feeling of inadequacy. my SO often reminds me that our son loves me and I'm doing a good job. however i suffer from depression and i rarely let anyone in on it so no one realizes the crushing weight i feel sometimes. also i have been thinking a lot about my weight and i fear it will affect my getting pregnant. it's a tormenting whirlwind of emtions and sometimes i really just want nothing more than to cry. anyone else going through a similar situation?