Back pain and spotting

Aunt Flo left me last Friday. The hubs and I decided to go for a swim. I did some jumping in the pool and many many flips. Tuesday I started to have lower back pain, on my right side. I accounted it to be from working to hard in the pool. Its still bothering me. However, today I had something else occur that has me thinking. This may be a tmi, but when I went to the bathroom I had some spotting along with cm. Est O was the 11th/12th. I looked back to April when I had my bfp and I had cm plus spotting. I don't have any records of back pain. Whats going on body?