stomach problems!!!!!!

The last few days I've been constipated. Even all day yesterday, then last night after my SO and I went to bed, I couldn't sleep because I had cramps soooo bad! Took a shower, still there. Went to sit on the couch to see if that would help, and ended up running to the bathroom with diarrhea. Weird, right?! That I went from one to the other in the same day!? I did have homemade Japanese food for supper, but not a lot, a normal amount, and thought maybe the diarrhea is from that, but then I've never had this problem before, EVER! So I did the worst thing anyone can do.... I googled. Saw that most women had this problem before their positive pregnancy test. Anyone have this happen to them? What was the outcome?! (Negative pregnancy test Monday morning.)