Constipation

I can’t believe I’m here asking this. I’m 30 weeks pregnant and I need to poop. It’s been 6 days and everything is stuck!! My butt is cramping so badly that I can hardly even stand up. Like leg cramps but in my anus. I’m up and down off the toilet in so much pain. Last night I even got on all fours in the bathroom because the pressure to sit on the toilet is so painful!! I take colace every day and now I’m taking miralax but nothing is working. The pushing is so painful it’s bringing me to tears and I legit dread having to try. Has anyone been this constipated and can tell me what you did that finally worked??! 🙈😢😩

PS I’ve talked to my doctor twice in three days about this. Both ob and gp. Both said water and miralax. 😩😩😩😩😩