A little right a little wrong

I am training for a half marathon on May 4. The running is going great for the most part. I have had one really really bad run. 5 miler that i didn't stretch for and didn't eat breakfast before heading out the door. Lesson learned, last nights 5 miles was a breeze. I am noticing though that i am hungry alot which I guess is expected due to calorie burning. I am eating about 1700 calories a day. BUT my weight is going up and up and up now. It had dropped and I felt good. Didn't really change much of my eating habits except to lower the amount of sugar in my coffee. It's not muscle weight either...my pants are tight causing muffin top my shirts are rolling up while sitting. I will start tracking my food again and see what it is "suggesting" but in the meantime does anyone have any clues?

Thanks in advance