Sore lower abdomen

Randi • Mommy of 3, number four on the way!
I'm just curious if anyone else is experiencing this or if it's just me. My lower abdomen is really sore and my right side seems to be very achey, even feels like a side ache sometimes. I haven't been prego in 7 years and don't remember being this sore or painful. I'm 5 months on Tuesday.