What is (or isn't) happening?

Deinonychus

I can't figure out why I'm not losing weight anymore. I started controlling my eating and dieting on January 3: no junk food, very little red meat, no alcohol, very little pasta, and exercising. On the 4th I started the 30 Day Shred, non stop I lost 21lbs. Over the next few days after I had finished the 30DS I lost another 2 lbs. That was about a week and a half ago. I've been stuck right there ever since and even gained a couple pounds (I don't know if that was real weight or because I was having a bowel movement every 2-3 days). My eating hadn't changed, aside from last Friday we went out and I had veal for Valentine's Day. I'm also breast pumping which is supposed to burn more calories. I don't understand what happened.

After I finished the 30DS I was still going to the gym at night, pushing myself harder to break this plateau, and doing Level 1 during the day. Is there something I'm doing wrong? I cut my calories lower, stopped drinking diet Coke (for the most part) and drinking sugar free drinks instead, am I not eating enough? I dare not say Starvation Mode, I saw the previous post- I don't even understand how that works. Plus I'm only going to the toilet every 2-3 days so something must be going wrong. Not to mention I weigh 264 so I should be dropping weight at a higher rate, surely.

I don't want to give up cause I'm trying so hard to lose the weight but this is really getting me down. I'm constantly reminded of my aunt who told me, when I announced on FB that I was losing weight, that I should only lose the baby weight and stop because I'm not meant to be skinny. That sounds really terrible right? She doesn't mean it in a vicious way, she's just ignorant as hell; though a very tiny part of me thinks maybe she's right. What she told me is what I think of when I don't want to go to the gym and then I work as hard as I can, but then I weigh myself and the scale hasn't budged and it's like those awful words have won......f***!