My husband and I are trying to conceive and had sex on May 15th. My period was due on May 25th. I am on a 28 day cycle and very regular. For the past 2 days I've been spotting. Started out as Dark brown, almost black discharge (not a lot). Now it's stringy and dark brown. I have back pain, and cramping, but I've never spotted like this before, and my period has never been late. I took a preg. test tonight, but it came back negative.
Do you think this is a late period?