I'm at 13dpo and AF is due tomorrow. Had some very strong pregnancy symptoms that have never happened to me before. I've been testing with superdrug hpts and these are known to be very sensitive needing only 10mi to detect pregnancy. All have come back BPN. Now of course it could very likely mean I'm not pregnant!! But with the things I'm experiencing I really do feel 'something' has gone on in my body. So IF I were pregnant but at 13dpo my hcg levels are below 10.....is this bad?? Does this mean I'm likely to get a chemical or miscarriage? I just don't understand how my hormones are having such strong effects on my body right now (constant sore, erect & tingling nipples, nausea etc) but are not high enough to show on the most sensitive of tests. Just interested to know if anyone has any scientific info or past experience with low hcg levels. I bet AF turns up when I'm reading this!