Can abdominal rumbling result from gas or constipation?

Hello doctor,

For the past ten months, I have been experiencing cervical mucus, which is sometimes white and sometimes yellow, but not in large quantities. Additionally, I often have intestinal gas and loud bowel movements usually occur before defecation. In the beginning, I had abdominal discomfort, and though it occasionally happens for a month, my stomach does not hurt. I experience these symptoms three to four times a month, and they do not worsen. Sometimes, the stool is hard initially, then becomes softer, but generally, it is normal. There are instances where one half of the stool is browner than the other, but overall, it is a normal brown color. There is no presence of blood, and I generally feel well. When these symptoms started ten months ago, I underwent blood and stool tests, both of which yielded negative results. What does this indicate? I suspect it might be IBS (irritable bowel syndrome).

Please provide guidance.

Thank you.