I think what you're feeling is totally normal and to be expected - and I'm sure you'll go through the whole gamut of feelings over the next 9 months.
I'm 14 weeks now and so starting to feel much more energetic and well than I did in the first trimester. So at the moment I am really really positive about the pregnancy - loving my little bump, talking to the baby in my head, imagining him/her - sort of bonding already!
However this is quite a new departure - when I first found out I was a mixture of feeling thrilled and excited, freaked out, disbelieving. I also had a feeling of "oh, actually, maybe I am not that bothered about a baby after all!" (but when I did a second preg test and it was negative because I did it too late in the day, and I had a few hours of thinking that I wasn't pregnant after all, I sobbed for two hours solid, so realised that actually I was pretty bothered!)
The next emotional "stage" was the nightmare that was weeks 6 to 11 - horrendous morning sickness 20 times a day, feeling dreadful, rather like I had a stomach upset, the flu, a hangover and terrible PMT all at the same time (it's due to those lovely preg hormones that soar through the roof in the first trimester!) For the vast majority of this period I felt depressed, miserable, fed up, pissed off with the baby for making me so ill, sick to death of being pregnant and at the worst times I actually thought "you know if I have a miscarriage I won't be bothered - at least an end to this nightmare!" My relationship with DH, although solid at bottom, went through the most challenging time ever - I could barely stand him anywhere near me, my libido disappeared, he had to do all the household stuff and care for me as I was so ill, so he was exhausted, lonely, run down and felt his wife had vanished for ever, I felt terrible because of it, and so on etc. That was also really miserable and felt like our whole world had suddenly been turned upside down in a few short weeks.
However, as you get to the second trimester, your hormones decrease and you start feeling back to normal again! DH and I are dead happy that things are good again and that we "survived" pretty well. In my current "blooming" state, though, the thought that I could ever have had thoughts of half-hoping for a miscarriage make me well up with sadness, and I feel full of excitement about being preggers, sexy and round and womanly, and I love our baby to death already! The downside of all this love is the agony of thinking that something might go wrong - what will my triple blood test reveal? Will all be OK at the 20 week scan? And so on ad infinitum ....
And all that in only 14 weeks - I am sure there'll be plenty more highs and lows along the way! No wonder I feel I've travelled a million miles since conceiving in early Sept! And there are still 26 weeks to go!
Please, don't worry about any of your negative feelings about pregnancy - it IS a massive thing to happen to you and it's right that it makes you experience a whole range of feelings about it. Whatever you feel at one moment, there is more than likely a whole new perspective and a whole new set of feelings just around the corner ... Just treat it as if you've just stepped onto a rollercoaster and, well, just "expect" that the next 9 months are going to be a rather hair-raising but exhilarating set of ups and downs!
Best of luck for a happy and healthy pregnancy
Bumps x