Still wondering???

Okay, it is 11 dpo today and still wondering where I am in my cycle.
The spotting I had at 5 dpo (started at 6 pm) continued through 8 dpo. It was definitely not a regular period. Since then I have still had a sore stomach/ cramping. 6 dpo I was very emotional and cried through out the day, was still very crampy, bad heartburn and had a lower backache. 7, 8, 9, 10 dpo still the same symptoms except I also noticed little purple veins on my chest which I had never noticed before and I also had some nausea off and on. I have been much more tired, actually went to bed before 7 pm last night. Today, 11 dpo I don't feel the cramps as strongly, but still have the other sx as well as stuffy head/ nose and headache and felt so cold and sick last night. So far I have caved in and done a few HPTs which of course have all been BFNs. The last one I did this afternoon. I have also been testing on the fertility monitor test sticks and it is showing that my estrogen has gone up over the past few days and still shows a faint LH line too. I do not know what all this means, was the spotting AF or was it indeed implantation bleeding? Why am I still crampy and have such a sore stomach with such bad heartburn?? I do not know the answers, but hope to get one soon. Based on the FM test sticks, it doesn't appear that AF is coming anytime soon (would show low estrogen and usually no LH present), but I have these cramps so...I am of course praying that all this means that a BFN is in the near future, but each time I take my BBT and it is low :o( (has been low all along, think the highest has been 97.5 or so) I think there is no way I am pregnant. I have researched online to see if indeed there are women who were pregnant with low temps, there seems to have been a few, but I really can't find to much on the subject. My sister (an RN who specializes in infertility says that your temp doesn't really matter and that women can be pg and have a lower temp).
I am trying to be hopeful here, I figure that the spotting, was more of a sign then any other month so far, but then again I had different symptoms the other months that I felt at the time were so promising, like chest tenderness, etc... none of that this time. I continue to use the progesterone cream twice a day just in case it is needed ;o). I am hoping to hold off on testing again until 12 dpo and 14 dpo. Someone I know got a BFP today at 15 dpo and I read about someone at 19 dpo, so I guess you just never know. I will update when I know something.