Oo, normal lang yan sa pregnancy, lalo na ngayon ka na sa 6 months! A few of us mums noticed na parang nag-libm talaga kami around that time kaya don't worry too much, it's usually just hormones at the weight gain na nagaganap. But since you're already 27 weeks, mas better na i-mention mo sa OB mo during your next checkup para ma-monitor lang properly at ma-rule out kung may other concerns, okay?