38 weeks and threw up!

So I haven’t been sick once throughout this pregnancy, I have felt nauseous but that was the height of it. But tonight my heartburn was really bad and I took gaviscon (like I have to do every night) and it didn’t help. So as the night went on I was feeling really warm, heartburn through the roof and just generally not well. All of a sudden I run to the bathroom and throw up for about 10/15 minutes straight. I had Diarrhea Monday-Wednesday and I thought maybe my bodies clearing itself out but then it stopped and I started feeling ‘normal’ again...do you think it’s a sign of labour impending or is that wishful thinking?