Is it normal to feel depressed?

I'm 19 years old and 29 weeks pregnant. At the start of my pregnancy i was a bit depressed but that soon went away but for the last 2 weeks i have been feeling really down in myself and its worse then the first time. I can't seem to stop crying over everything and think i am going insane. I'm getting awfully paranoid about my boyfriend going out with his friends as i feel he will cheat on me bcoz i dont feel attractive and i feel as if he dont care about me even though he has assured me he would never do that to me and that he does but i just cant seem to believe him..I can't seem to shake this feeling of depression,paranoi and lonliness..I have a past of being depressed before my pregnancy which led me to drink alot to deal with my problems for a bit..but now i have to deal with them on my own which i find impossible to do bcoz i cannot explain what is wrong with me or why im feeling like this its so frustrating bcoz i dont know myself sometimes i dont even want to be here anymore,my baby is the only thing keeping me going..i just feel so alone in all of this and i'm wondering if anyone else is going threw the same thing.

[lisa1905]

i know been pragnant is hard , i can undrestand u, i am 39 weeks pragnant and so  depresse , if u tell dr, they will say its normal,maybe it is but its frustrating as u said . most of times u can not control it. and if u talk to someone eals maybe they say its hormon, i dont know what is it , but try to hang inthere u r almost 2/3 done, stay strong :)

[Confuzed4patient]

Im feeling exactly what your saying.everything you going through iam also.and iget very upset when itry to talk to somebody about it n they say its the hormones.idk what can help but talk to someone about ur feelings bcuz if u dont they will eat u up.thatz what im tryn to do but idont have anyone either.im 20 yrs old 31weeks and with my first child.sometimes talking to someone even if u dont kno them helps.ihope ihelped

[Confuzed4patient]

Im feeling exactly what your saying.everything you going through iam also.and iget very upset when itry to talk to somebody about it n they say its the hormones.idk what can help but talk to someone about ur feelings bcuz if u dont they will eat u up.thatz what im tryn to do but idont have anyone either.im 20 yrs old 31weeks and with my first child.sometimes talking to someone even if u dont kno them helps.ihope ihelped