Pump sites?

I used to wear my pods on one side of my abdomen, after 3 days I would switch to the other side. I did the same with my upper arms. I am 3 months pregnant now and find it very uncomfortable to wear the pods on my stomach. My belly is hard and tight and it seems like the insulin just wants to build up and not absorb. I tried wearing the pods on my upper butt back when I first started pump therapy and it never would work. I would always bleed a lot and didn't get good absorption. I don't like insulin in my legs either because I am pretty active and my thighs are muscular. So basically I just use my stomach and arms and now that I am pregnant the stomach isn't working so good either. Is it OK to just rotate my site every 3 days on my arms? I am worried about getting scar tissue.

I use two different sites: either my sides, just above my hip or my butt along my bathing suit line (I wear boy-brief style underwear with no elastic around legs so I don't have to worry about snagging on my pump site). I am only 5'2" and weighed 105 lbs before pregnancy, so I have always had trouble finding enough fat for my sites.