Stop worrying about the weight you started pregnancy with. You cannot change how much you weighed when you concieved and you cannot go on a drastic diet to lose weight.
I'm not saying that there aren't increased risks associated with being overweight, but there are also plenty of larger women who have healthy, straightforward pregnancies and plenty of slimmer women who have complications despite their lighter bodies. General trends aren't going to be that useful to you, you just need
I am now 33 weeks with my first baby and have had no weight related complications so far. I was losing weight prior to becoming pregnant, but got lucky (after 5-6 years of TTC) when I was only about half-way to my goal. So I do get a little frustrated because I was doing the right things for 9 months before I got pregnant, but still get counted as a larger lady because it just wasn't long enough!
What you can do is to try and moderate your weight gain in pregnancy by making sure you eat well and get some light exercise in. I haven't been as good as I could have (some bad eating habits crept back in during morning sickness and are still sticking around) but I've not put on much weight at all at this stage.
You say that you don't want to eat much healthy food at the moment. Is it possible to make some small changes to your diet. Nothing drastic, just switching in some healthier options (e.g. wholemeal rather than white bread, a fruit based dessert instead of a heavy pudding etc) or reducing portion size of less healthy stuff? (Making vegetables/salad take up more room on your plate so there's less room for the other stuff).
I think a lot of the downsides of starting off overweight can be counteracted by eating sensibly during pregnancy. My blood tests and so on have been fine despite a family history of gestational and type 2 diabetes, though this may have more to do with my age than my -less than perfect-- eating habits as risk increases with age.
Take it one meal or snack at a time and try to think about little changes you can make. Discuss any concerns with your midwife.
Can I ask how overweight you are? Only, some women worry about their weight when they are just a stone or so overweight and if that's the case you need to know that the risks are mainly associated with women who are very overweight. My BMI was 41 at booking in, dropped to 38-39 during a long period of morning sickness, and has snuck back up to 41 over the last month or so. I might be a few pounds heavier than when I started pregnancy. With a month or two to go.
My midwife considers me low risk and so far would support me to give birth at the local MLU based on me having a healthy pregnancy so far. I might decide to go to the CLU though for weight-unrelated reasons (antibiotics for Group B strep).