Weight gain is irrelevant during the first trimester. If you had intercourse and missed a period pregnancy is possible.
It is a necessary biological response for a woman to gain weight during her pregnancy. The weight is added from fat that holds nutrients and water that both provide for and protect the baby. It is not possible to not gain weight during the pregnancy without harming the baby, but there are ways to lose the weight after the birth of the child.
While it is usually possible to carry a healthy child after weight loss surgery, it is recommended that you wait at least 18 months after surgery to get pregnant. http://www.yourbariatricsurgeryguide.com/pregnancy/
About 9 ounces!
By eating healthily.
I definatly believe that it is possible to lose as much weight as possible in 2 months. "As much as possible" means the commetment that you put into loosing it.
Your main concern should be making sure you baby is growing properly and receiving enough goodness for him/her to grow. Eat healthily. Like it or not your weight will change, even after your pregnancy but by eating healthy and moderate execise during your regnancy shouldn't make it hard to shift the weight.
While it may not be possible to drastically alter your body shape in a few weeks or months, it is possible to make a great beginning to a healthy lifestyle by getting rid of unneeded calories like coffee and soda and by exercising and eating healthy foods. There is no cutting corners if you want to lose weight healthily.