Chemical Pregnancy Pains?

Victoria
Hey ladies, so I had a very very faint positive last Friday. Then, all tests I took were BFN. I woke up yesterday to the worst cramps I've ever experienced. AF started a few hours later, and intense nausea and bloating have continued through today. 
I'm assuming that I had a chemical pregnancy. But does this accompanying pain sound normal to anyone? Has anyone else experienced this?? 
Thanks in advance for sharing...