Depression Resurfacing During Pregnancy?

Julie
So I have had depression and anxiety since I was about 13, have been on and off a lot of different meds over the years. Had a really bad break about 4 years ago, went back on meds for almost 2 years. Was really feeling like the medicine was hurting instead of helping (which usually happens for me after a while on the same medication). I weaned myself off and have been very mentally healthy since then. My husband and I got married in the fall and I got my IUD taken out in November. We started trying to get pregnant with #2 right after that and got our first positive on April 6th. I have been very excited but recently I have just felt completely defeated. I'm always tired no matter how much I sleep, I either eat the whole house or literally nothing at all (no nausea), I'm feeling a very strong urge to just be alone and like this pregnancy is just not the right thing. All out of no where. I have no idea if pregnancy is causing my sudden emotional slip or what. I really don't want to take medication during pregnancy and I'm just on the fence about what to do. Is it just part of pregnancy emotions or something bigger? Anyone else's depression issues flare back up during pregnancy? Even after a long time of being stable and healthy?