Red spotting during pregnancy

Hey y’all I’m 19 weeks 5 days pregnant, ever since about two weeks ago I’ve started having vaginal spotting here and there, I’ve been seen numerous times by my obgyn and every time they check me they say my cervix is closed and I am fine and baby is healthy. Some days are worse than others, it’ll be heavier or lighter spotting, but by no means fills a period pad. I mostly notice it right before I have a bowel movement that it’s the worst and then subsides down after my BM. Sometimes when I wake up in the middle of the night I experience red/brown spotting too. I had my anatomy scan done 2 days ago and I do not have any issues with my placenta and there is no blood in the uterus, the results of my anatomy scan are normal, the doctors do not know why I have this bleeding/spotting during my pregnancy and tell me to call and keep an eye on it if it turns into serious bleeding and cramping. I am only half way and feel like I have to constantly worry. Has anyone else experienced this throughout their pregnancy? It’s so hard to stay sane seeing blood when I wipe and the doctors say it’s normal for me.