Back Pain and Spotting

Aunt Flo departed last Friday! When she left the hubs and I decided to go for a swim. We swam all weekend. Diving, Jumping, Flipping, Standing on my hands, it was pretty intense. Tuesday I started to have some lower back pain, on my right side. I chalked it up to working out to hard in the pool. I've done that before. Well my back pain is still here, but I tolerate it. I try not to take pain killers, just use ice and messages from the hubster. Today has thrown me curve ball. This may be tmi, but you are going to hear it. When I went to the restroom I had some spotting and cm. I looked back to April when I had a positive pregnancy test and I had spotting plus cm. No back pain. Body, what are you doing?