Spotting?

So I'm 37+4 and I just took a shower and noticed I had some spotting on my liner. Thought I was tripping so I went pee before getting in the tub and sure enough it was light blood. Since it was small I didn't panic. But now that I'm out and getting ready to lay down I'm having cramping in the lower left side of my stomach. The pain is sharp but not lasting more than 30 seconds but kind of often. Not sure what's going on here or if I should probably start preparing myself. Whether she comes tonight or in a few days, I need to be prepared lol. I haven't even packed our bags. What do you guys think?