Should I test again for pregnancy?

I highly doubt I am because I took an early test before my AF and it was negative. Then my AF came and I had normal full bleeding. I bleed for 2 days and then spot for 3 which is how I am every month. The reason why I thought I might have been pregnant was before my AF I had really sore breasts, tender nipples, nausea when brushing teeth, and lots of vaginal discharge with no odor or itch. After my AF those symptoms went away. Now I'm starting to feel very sore abdominal muscles as if I did 100 sit ups. I'm not bloated or anything but the muscles are very sensitive near my belly button. No cramping or othe pains. Just sore muscles for NO reason. I read so many posts where sore stomach was first symptom at 5 weeks. I'm 99% sure I'm not pregnant due to having a normal period and negative tests... but if I am then I am 5 weeks. Is another test necessary? What else could cause muscle soreness in the stomach? I do not exercise at all.