Constipation or contractions 😖

I know this sounds crazy but I can’t tell if I’m having contractions or if I’m just really constipated.

I woke up feeling really sick and like I had to poop really bad so I ran to the potty. Nothing came out but the cramping and tightness and pressure was so bad I thought I was going to vomit. When the pain “passed” I came out to the living room. I still feel pressure and achy but not that extreme pain. It’s worse when I lay. The pain comes and goes but hasn’t been as intense for a bit. Still haven’t pooped

I’m trying to miralax to see if I can go potty and relieve some pain.

I don’t think I’ve lost my muscle plug yet and have no other signs of labor

*im measuring 36 weeks along