Welcome to MDC!! 
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Let's break this down a bit...
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CD 1 September 7th
CD 8 and 9 unprotected sex
CD 10 AF like cramping and low back pain
CD 15-17 dull cramping
CD 17 emotional
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How long are you cycles normally? When do you expect AF? Have you ever charted your temperature and/or cervical fluid before to determine how long your luteal phase (the time between O and AF) is? Do you recall when you had patches of fertile cervical fluid (CF), creamy or eggwhite in consistency?Â
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Without being able to pinpoint your O day or even if you have O'd yet this cycle, it's really difficult to say what is going on. It is not likely that you O'd on CD 10, but also not completely impossible. A surge in progesterone mid-LP (luteal phase) would be caused by implantation. Implantation occurs between 6 and 12 DPO, but most often (84% of the time) between 8 and 10 DPO.  Seven DPO (if you O'd on CD 10) would be in this range, but again, I wouldn't think it terribly likely.
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The cramping and dull aching could all be ovulation symptoms, but not necessarily mean that you did indeed O. And keep in mind that since similar hormones are involved with ovulation, menstruation, and pregnancy, many of the symptoms for each are very similar.   You could be gearing up to O right now with the dull cramping and emotions. Are you getting creamy or eggwhite CF now?
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Sperm can live for about 5 days in fertile CF so if you had unprotected sex on CD 9, it could potentially live until around CD 14 and you may not have even O'd yet. Really, you will have to wait and see what happens over the next 2 weeks or so. If you did indeed O on CD 10 then you should get accurate results on an HPT by CD 22-24 (next Wednesday-Friday) with a sensitive, pink dye test like First Response Early Response.
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If you'd like more information about charting your next cycle (if you're not pg), just post and ask!