I am also currently pregnant and have had the constipation that goes with that on top of involuntarily holding it. The pain has been real.
It's amazing how much my body relaxes once the family is gone and I am able to go. Today our house is officially guest free for good, and I have been able to go a few times already. I wish people attempting to stay over for terrible amounts of time would realize how much we need our own space. How important it is and how physically painful it is to not have it.
Prior to our apartment, my husband and I had a townhouse. It was bliss to be able to sneak off upstairs in a very private level and bathroom to relieve myself. The pain of having a smaller space with no privacy is terrible in terms of trying to use the bathroom.
I'd like to one day get help to relax my body to be able to go, but in the mean time I am going to work on setting boundaries so that I never lose my space for undetermined amounts of time again.
I've had problems with this my whole life, but that was the absolute worst and painful it has ever been.