Feeling "off" before going into labor?

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Anybody just feel "off" for a few days before you went into labor? I've been very tired, in a weird mood & have had to poop(sorry tmi) multiple times a day for the last few days. I woke up last night nauseas and having stomach pains (like poop pains) and went to the bathroom but nothing happened. I'm just wondering if anyone has experienced any of these things before going into labor.