Congratulations!
As most others have said don't focus on loosing weight. But make sure you have a healthy diet. Lots of veggies/fruits/lean meats etc… Also get yourself a pregnancy multivitamin, or conversely if you're not into vitamins/pills look into a herbal tea with lots of vitamins and minerals. Nettle leaf is really good, but a naturopath or midwife could probably recommend a few others.

I've put on a heap of weight both this pregnancy and last one, but I've not eaten a lot of junk, it just seems no matter what I eat I gain a kilo a week. Last time that was even despite being sick through my whole pregnancy. That having been said last time I lost all the weight I had put on, plus some when breastfeeding DS (hoping that happens this time as well). I didn't diet, I just made sure I didn't over eat, and that I healthy and balanced meals and the weight just fell off, so if you plan on breastfeeding that may help with your weight loss post pregnancy.

Cramping. Perfectly normal. Had it in both my pregnancies early on and heaps of other women do as well, although it can be a bit disconcerting at time.

Good luck with your appointment on Thursday!