I'm 5 weeks pregnant but I feel like I'm 6-7 months! Starting later in the day I start feeling my stomach muscles stretch and tighten up. It feels like I just did 100 sit ups! Sometimes to the point where it feels a bit suffocating. It doesn't hurt, it's just really uncomfortable. I never experienced this with my first baby until I actually was in my third trimester so idk if it's normal to feel it this so. with your second pregnancy or what.. Help!