Maybe pregnant?

Hello! I'm having some issues and was wondering if anyone else had a similar experience. I had a miscarriage on July 29th at 12 weeks and got a short period on August 27th. My cycles were around 32 days prior to the MC. Last week on Oct 2 I had a short 3 day period (a 37 day cycle this time)...but now a few days later my breasts are sore, my back hurts, and I feel nauseous sometimes. This is how I felt when pregnant the 1st time. I took a test and it came back negative..any advice ladies!? Thanks!