Reddit mentions of Vega One All in One Nutritional Shake French Vanilla - Plant Based Vegan Protein Powder, Non Dairy, Gluten Free, Non GMO, 29.2 Ounce (Pack of 1)

Whey is not vegan (it's a byproduct of dairy cheese production), but there are protein powders that are vegan. Vega one has a great all purpose shake (20 g protein serving) that is like a multivitamin breakfast shake.

http://www.amazon.com/Vega-Nutritional-Shake-French-Vanilla/dp/B00R0Y0V94/ref=sr_1_1?ie=UTF8&qid=1453441416&sr=8-1&keywords=vega+one

They also have post-workout shakes that have 30 g of protein per serving:

http://www.amazon.com/Vega-Performance-Protein-Powder-Vanilla/dp/B016D9IGRA/ref=sr_1_10?ie=UTF8&qid=1453441416&sr=8-10&keywords=vega+one

Peanut butter powder can add protein to anything, as well as peanut butter flavoring!

And Cliff Builder bars have 20 g of protein but a ton of sugar:

http://www.amazon.com/CLIF-BUILDERS-Protein-Chocolate-Count/dp/B000GPRZSO/ref=sr_1_1?ie=UTF8&qid=1453441513&sr=8-1&keywords=cliff+builder+bars

For protein shakes I really like Orgain blended with a banana and some frozen strawberries and maybe some spinach. If you're looking to up your nutrient intake for your pregnancy you could get Vega instead but it's pricier. I also recommend a brown rice or quinoa bowl with peas, edamame, hummus, tofu, whatever tickles your fancy. Seitan has a weird texture, it's better when it's a side mixed with veggies or rice.

Similar boat as you. These sources helped some since I fall in the endomorph phenotype more than anything:
http://www.bodybuilding.com/fun/best_endomorph_workout.htm
http://www.bodybuilding.com/fun/bodytype_nutrition_guide.htm

Best source to really get going and disciplined: http://www.bodybuilding.com/fun/wotw70.htm

What I do: Workout is 45mins to 1hr Basketball mainly knockout 1 v 1 with my workout buddy (the cardio is nuts). Make sure you do all the jumping. Usually 5-6 times a week. Weights after for about 20 mins or so, enough to keep up with all the muscle groups once a week.

My diet is still not great but most helpful for me was to watch out for the carbs. It's not fast food that is the issue per se, it's the sugar and simple carbs that's the issue. I would try to replace some of your carbs (grains, pastas, breads, rice, potatoes) with veggies (steamed, grilled, baked/roasted, stir fried) and increase your protein intake if it's too low. At 15 it's hard to control what you eat when but really try not to eat a lot of carbs at your evening meal especially late. Make sure your water intake matches your workout regimen (seriously watch out for dehydration if you haven't been doing much working out).

If you're going for 4-5 meals a day this may help you some: http://smile.amazon.com/Vega-Nutritional-Shake-French-Vanilla/dp/B00R0Y0V94/ref=sr_1_2_a_it?ie=UTF8&qid=1463283246&sr=8-2&keywords=vega+one
Vanilla flavor is decent. Powder is a bit gritty and gross at first (it really grows on you though especially as you cut out the sugar/simple carbs in your diet).

The changes take a while to start seeing results so don't get discouraged. I noticed the increase in energy I had before I started seeing weight loss and muscle gain. Best change I made was to get a workout buddy. If nothing else you'll have a friend to hang out with while working out making the whole activity more fun and ultimately making a good habit of working out.

Sorry for the long post but good luck man.