Depends on lots of things, some people are very sick the first trimester and lose weight and then they make up for it over the rest of the pregnancy.
You technically don't need anything extra in the first trimester, and about 200-300 calories extra a day in your second, and 500
Ish in your third, which isn't loads.
That said, very hard when you're starving and don't want certain things but you can tolerate all the naughty stuff.
My suggestion is that you chat to your midwife about the recommended weight gain for your pregnancy weight, and they might refer you to a dietitian to give you suggestions on meals and calorie intake.
While people say it doesn't matter what you eat while pregnant it kind of does, uncontrolled calorie intake can mean a bigger baby, gestational diabetes, higher blood pressure etc.
Not trying to scare you, I'm sure its fine but it would be good to get a handle on it to make sure you and baby are as healthy as can be.
Congratulations on your pregnancy xx