I had a pomeroy tubal 14 years ago. My cycle has run like clockwork every 23 days. My last cycle was 11/12/13. When my cycle was supposed to start I spotted a brown discharge for 2 days. I took a HPT and the first one came out positive. I took a second one and it was negative. I have been having mild cramping, headaches, mild back pain, nausea, bloating, gas and flutters in my belly. I took a progesterone blood test and it was negative. I also have Lupus. Please explain what is going on.