Worried about my period this month (sorry if tmi)

[Blossomhill]

My periods are normally fine. Not too much pain, not too heavy.
Well this month they have been awful, really heavy and so painful. I feel so ill.
Could this be a sign of something?

Could just be a one off. I'm sure I've had some awful ones at times. I would keep an eye on it, see if it happens again. Main thing that springs to my mind is fibroids, peri-menopause (run up to menopause), or very early miscarriage. But could well be none of these.