Letrazole luteal phase

For those of you who have taken letrazole during the beginning of your cycle at some point, what, if any, side effects did you have from the letrazole during your luteal phase. I ovulated a few days ago, and I have had loose stools and heart burn for about 24 hours now. Historically, I am constipated during my luteal phase, so this is quite different. Just curious if this might be related or if it is just a fluke of the luteal world. Oh, and I know I am not pregnant yet at all and am not thinking these could be pregancy related in any way. Too early for that. Thanks!!!