I'm glad you are working on the constipation issue!
I am sure that waiting two or three days is not healthy, though some wait longer.
I know well how one problem can complicate other problems, which can make it difficult to get a balanced diet to be healthy. And, doctors, in my experience don't always know enough to give proper advice. Even specialists will focus on one part of the body, and without meaning to, will neglect what the other part needs. I think it is up to us to try to find the balance ourselves, looking out for all of our own needs.
I think it is wise to ask the GP to check if the hemorrhoid is indeed causing the bleeding, to relieve your mind and be sure it is not more serious. The doctor should know how to press the lower left side abdomen just above the pubic bone to check for pain, which indicates constipation that you may not otherwise notice. There can be spots of constipation internally that don't seem symptomatic. If the doctor doesn't do the pressure test, ask your mate to do it. It should not be painful or tender there. (it won't hurt the baby)
Of course constipation is relative. I don't presume that I know exactly what you need for yourself and I am no expert. I am going by my own research and experience and talking with others with similar problems.
As far as the gastro problem goes, I agree it is good to not eat raw
fruit or vegetables or a even a cooked coarse fiber as is in broccoli, but most cooked
fiber is not the same thing, and in my opinion it is imperative, with fissure and hemorrhoid, to be sure to not ever allow the stool to get hard or dry at all. I wouldn't wait 24 hours to see how things are; I would drink a little prune juice daily to keep the stool soft enough to never have to strain at all. More than one stool a day can allow the other problems a chance to rest if not heal.
Pregnancy changes how things sit internally, early on, and the weight difference includes the water in the womb, not just the tiny baby. Water weight increases fast. However, even if your early bleeding was from pushing the stool or womb baby and water weight, either way, you are now five months along with definite increase in pressure. All organs are relative which affects bowel and anus issues.
Some believe our outgo should equal our intake, as the body only accepts minute parts from food to absorb into the blood. The rest is waste. We see animals' outgo is close to their intake, yet we humans can assume it's OK if stuff sits in our bodies for 24 hours or takes days to get out. We may have no idea how impacted our intestines and bowels are.
I had a friend that ate normally and had one bowel movement a month...I kid you not. She had serious skin disease...the skin is an excrement organ, and her skin was trying to get rid of the waste impacted in her. Once a month she would take a load of laxatives and sit on the toilet for hours. When her doctor found out he insisted that she get weaned off the laxatives and eat better so that her bowels moved at least once a week. She never did eat right and ended up dying from liver failure (another cleansing organ) at a young age. This is only one reason I think it is not optional to have regular bowel movements.
I don't like going to doctors, and I feel for you as it can be so humiliating!
I hope you let me know what the doctor says.