Firstly, I'm so sorry you have this long cycle going on!

With no temps it's hard to tell where you might be in your cycle. To tell you the truth, what you described sounds a bit like my O pain. You can get cramps in the middle area, not just the sides where your ovaries are. I'm sorry you can't go for a blood test.. but I think it's pretty unlikely that you're pregnant (like past 15DPO pregnant) with no +HPT.. it does happen but not that often. I hope you're an exception!