When is it depression

Hi All

Sorry for the LOOONNNGGGG post

I'm new to the forum. I actually registered about 5 weeks back already and haven't posted anything else yet.
The reason for that is actually part of my new post/question. When should I become concerned that I might be depressed and/or will this blow over?

As per my introduction, I had a miscarraige in June at about 5 weeks. After that, I could not wait to become pregnant again.
This what seemed like FINALLY happened again in October. I'm currently 9 weeks, going for my first scan next Tuesday.
At first I was very excited. Until week 6 when I started morning sickness and nausea etc. I'm not a "softy" and I never EVER get sick. Haven't had a cold or flu within the last 15 years. I even felt that the Dutches who was suffering from Hyperemesis was just overly "sensitive" and that it can't be that bad. But this MS just felt like it broke me down physically and emotionally. Between weeks 6 and 8 I barely ate as much as a piece of toast in total. I couldn't keep anything down. Got some prescribed medication - which didn't seem to help.
Since this past weekend however I have been feeling quite a lot better. Maybe the hormones are settling a bit.

Anyway...

I'm struggling to become excited "again" about having the baby. I don't even have any excitement for the first scan. I actually can't bare reading anything to do with babies/pregnancy. As if I'm going to be nauseous again. Thus, I haven't been on the forum really.
Actually, I don't feel excited about anything at the moment. Not even for the concert this coming Friday - that I've been waiting to see for years.
It feels like all life has been sucked out of me. As if I'm blaming this little embryo for the way I've been feeling (I'm REALLY sorry, I know a lot of couples want kids and are struggling to conceive and here I'm going on about stuff every other pregnant woman goes through - and me - I just can't seem to handle it)

My question is, will this "depressing feeling" past? I'm only 9 weeks now - still a long way to go. Don't get me wrong. I do want this baby, I'm just not overly excited about ANYTHING at this point. I am feeling ALOT better physically than two weeks back and my hubby has been very supportive and he can't wait for the scan. I just don't share his excitement. I'm afraid of post natal depression. I use to think harsh things about new mommies not being that perfect new mommy I have had in mind, obviously suffering from Post Natal depression. PS: I will read up on the sections about Post natal depression.

I guess I'm hoping to get positive feedback from people like me to say that this too shall pass - once I see that heartbeat next week, all will be ok again.

Once again, apologies for the long post complaining from beginning to end, but I believe that this is what this forum is about. Sharing experiences - good and bad - and support. I'm not trying to be offensive to anyone and I'm sorry if what I said have been.
Should I just suck it up and get back to reality?