What is going on?

31 weeks as of yesterday and I've been starting to feel cramping and hardness of my belly sometimes when it happens, and also more pressure down there. It's not painful but it's uncomfortable. This has been happening since Tuesday night and It comes and goes throughout the day. 
I also noticed I had tiny spots of blood and a few more when I wiped after using the restroom, I haven't noticed anymore though. 
Should I be worried? Or is this normal? 

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