36/m cancer patient receiving chemo, no significant BM since 11/2. It's been 5 hours since I completed a colonoscopy prep (238mg Miralax + 64 oz Gatorade) with no bowel movement. At what point do I go to the ER?

As titled.

• I have cancer, currently going through chemo, and pain meds stopped me up last week.
• I'm immunocompromised (possibly neutropenic), so I'm trying to avoid the ER if I can.
• Been taking Senna every day, Miralax every other day, but my system wasn't having it.
• Used a fleet enema yesterday and only 5 or so pebbles came out. The saline all came out.
• Likewise, since I finished the Miralax mix today, only half a dozen pebbles have come out, and with too much force at that.
• Magnesium citrate was either sold out or recalled at all my local drug stores today, so it's unfortunately not an option.
• My abdomen has been rocking and rolling (gurgling, cramping, gassy) since I finished, even as I'm typing this.
• My telemedicine benefit won't work because my insurance company's site is down.

This is a clusterfuck. I feel like I have a blockage, but also feel like I've done a lot to try to move that blockage through. Is there anything else I can do to avoid the ER?