Anyone else feel depressed & lonely ?

Parish

Anyone else be randomly feeling depressed and lonely ? It’s like one day I’m happy about my pregnancy & next thing you know I feel regretful like if maybe I should have waited a few years before having another one since I have a 2 year old. Every time I look at my son when he’s sleeping I break down asking my self why am I doing this to him by having another baby when he’s still small and needs lots of attention. What can this be ? Anyone else feel this way