Hormone diarrhea?

Once a month or so (just started noticing a trend) I get diarrhea with stomach cramps for about half an hour to an hour. I had a baby almost a year ago and just started getting periods again. Only thing is I only for sure know I had this diarrhea a week before ovulating after my first period. It happened again at some point and now it’s happened again, while waiting on my 3rd period. Supposedly my period is days away so it’s not the same timing as the other time that I know of. Does this seem strange to anyone? It’s really inconvenient and I’ve never had any issues like this. In fact my husband says I have an iron gut because nothing phases me in either direction in the bathroom department.