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I think my best tip is to just eat mindfully. Aka, really think about what you are doing, how your food tastes, how you feel. Sure, those cookies look delicious but you’re not that hungry and they’re not going to give you as much pleasure as if you were hungrier and really wanted them. Does that make sense? Try and balance all of your meals with protein/fat/carbs/fiber to prevent blood sugar spikes and it will make you less apt to reach for something less nutritious.

As for working out, I can’t help you out I stopped after my first trimester, but I try and stay on my feet a lot during the day. I’m a dietitian so I could talk food all day

@cyoung: Besides being a p/t EN professor, I am a NASM-certified personal trainer (* degrees in Exercise Science and Biomechanics). While I am not a nutritionist, I may be able to offer a bit of advice.
In your first trimester, your baby only needs 100 calories more (per day) than your usual caloric intake; however, if you are already overweight from over-eating, you probably do not need to add that 100 calories on. One hundred calories can equate to an extra large hard boiled egg, a large glass of milk, a serving of PB (or almond butter) on a few carrots, many types of yogurt cups, one sandwich thin (no toppings), etc.
In the 2nd and 3rd trimesters, the caloric need to sustain a pregnancy is greater at 300-500 extra calories per day; however, you would need to figure out your pre-pregnancy caloric needs (* most women need between 1200-2000 calories per day) and then add 100 or 300 calories accordingly. Since you have been overeating, I would visit a nutritionist first to figure out your base nutritional needs and how you may best achieve a slow gain during pregnancy.
Another goal should be to tackle the snacking before it is out of control. Start a food diary or use an app to track your meals (and calories/nutients) to make certain you and baby are eating "healthy." My advice is to ask yourself why you are hungry when you want to eat ... wait 10 minutes and then see if you are still hungry for it. Drink lots of water. Thirst can mask itself as hunger... broth soups are great! You can have a soup, feel "full" and eat half the calories you would from a carbohydrate rich diet. Make certain soups are rich in vegetables for your growing baby. Also, figure out your cravings and make healthier substitutions ... Sometimes, a salty craving can be fixed with a pickle over chips, a sweet craving can be fixed with a yogurt (or gum!) rather than cookies or ring-dings, a savory craving could be a few craft "boutique" cheese slices with olives or tomato versus pepperoni ... Do not deprive yourself of healthy choices while pregnant, just limit the junk. Everything in moderation.
Now here is my favorite part, exercise. In early pregnancy, there are very few limitations on exercise. Physician's ask you don't ride bikes and horses (or jump out of planes) for various commonsense reasons, but honestly, I paddleboarded until I was 5 mos pregnant with very little issue. Do things you ENJOY. Some examples of pregnancy approved exercise: Pregnancy yoga for flexibility, lift light weights to maintain strength (and burn the extra visceral fat that is not aiding in the support of your pregnancy), swimming is amazing, Zumba is fun while pregnant (* the baby will react in the later months), walk or hike ... simply, just move and keep your activities varied so YOU don't get bored. Also, in your later months, both the prone and supine positions will cause you discomfort and should be discontinued as prone places your body weight on both your organs and the baby while supine puts pressure from the growing fetus on the vena cava leading to a reduced return of blood flow to the heart which is bad news for you both.
Best of luck and if you have any further questions, do not hesitate to write.

@cyoung: No problem. I'm glad it was helpful.