Anyone have a flat belly after having a baby and getting stretch marks on your tummy?

I had a baby the end of January. My pre-pregnancy weight was 118 and I gained 30 lbs. I didn't get stretch marks until the last week. I was really small until the very end... it seemed like I woke up with a belly one morning, it was weird. Anyway, the last week I got really swollen and I'm guessing as a result I got stretch marks. They are on my lower stomach(below my belly on). I lost all my weight very quickly. I didn't try to either.. it just happened. I'm nursing so I'm eating healthy(but a lot! lol) and I regularly exercise. My stomach is still squishy and I still have some work to do on that... My question is... Will my stomach be flat again?? Stretch marks create extra skin, so will that extra skin be saggy and gross... or is it possible to get a firm, flat stomach again? Also, if this is possible(b/c I've never seen that) does anyone have pictures to prove this to me?