Poop problems 💩 (TMI)

So I've had really horrible constipation my entire pregnancy so far (I'm 17 weeks). I have Hyperemesis Gravidarum so it's hard for me to stay hydrated or eat a good amount throughout the day. I'm working on trying to drink more and eat better, but it's hard even with my prescription meds. Anyway. I go #2 probably once every 2 weeks. It's always painful, hard lumps, and I always cry. It's awful. However, today, I had the urge to go and went ahead and went. Halfway through, I checked to make sure I wasn't bleeding, and noticed my stool was white. The past week I've been taking Phenergan suppositories, because I can't keep the pills down. My doctor is closed due to the holiday, so I can't call to ask him if this is normal. Has anyone experienced this? So sorry for the TMI, but I don't want to make a trip to the ER unless I really need to.