Painful cramps at 27 weeks

H 💍👧🏼👶🏼🤰🏼

I’m almost 27 weeks and I’m struggling with cramping that’s really painful. It’s pretty much constant unless I’m laying down on my side. As soon as I stand up, the cramping comes back. My stomach is as hard as a rock and it’s very painful. It’s very hard to walk or do anything. It’s better in the morning and gets worse as the day goes on. Tonight it’s had me in tears. I have 2 small children (this is my 3rd and final pregnancy). I’ve never experienced this with my other 2. They’re 2.5 and 4.5 so just laying down all day isn’t much of an option. Any idea what might me going on or what I should do? It’s gotten so painful I’ve contemplated going into L&D to get checked out but I feel like I’m overreacting lol.