Depression

I'm afraid I'm becoming depressed. I haven't felt like this is a long time. I'm a full time stay at home mom and recently alot has changed. My s.o and I moved out on our own again, after living with family, I'm currently 8 months pregnant, we've been having car issues and I feel everything is piling up in such a short time. I'm at home 90% of the time with my toddler. The only time I really get to go out is when I have a doctors visit. My toddler can drive me insane and I feel my days are becoming repetitive. Same thing. Diffrent day. I'm afraid because I haven't even given birth yet and I'm already feeling this way. I'm going to be a stay at home mom soon to two kids, instead of one. I'm just afraid of falling into post partum after the baby is here. I notice myself making comments like

"I get to stay home all day and clean again, great"

"Tomorrow is going to be the same thing anyways"

I just feel bored and I hate it. I give myself hobbies but it's not enough. I rarely smile and most of the time I have a gloomy face. My family slightly noticed when I went over for game night and I wasn't my usual self amd was being quite negative. My mom jotted it down to being frustrated because I'm so far in being pregnant I just want it over with. I agreed. I got so used to doing things once or twice a week when we were living with family. Going out for lunch. We would have date nights almost every other week. Take our son out and about and now I'm at home. I knew things were going to be different because we have more to pay but I didn't know being at home so much would effect me this badly. I even feel I'm being different towards my s.o. I'm not as lovey or attention seeking and I lose my patience with him and my son very quickly. I feel awful. I don't know if it's the start of depression or maybe I am just tired and ready to give birth. Hard to tell.