So I believe I'm about 4 weeks pregnant. Yesterday is when I started getting some mild cramps and also some very light spotting. I was just thinking it was implementation bleeding. Today I am still spotting but the cramps have gotten a little worse, more like my period cramps. Then I started getting lower back pain that is aching and almost a burning sensation. Is this normal at all? I am going to my doctor tomorrow. Just hoping it's going to be okay...