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Technically I think you could be at a five and be in the range of normal. Your numbers don't matter as long as they are doubling every 48 to 72 hours. I would buy a test with a low sensitivity. Something with a 50 to 100 miu and test at 18 dpo to see if you get a positive then your numbers will be climbing like they should. That's how I would do it.

hCG levels in weeks from the last normal menstrual period:

3 weeks LMP 5 â?? 50 mIU/ml
4 weeks LMP 5 â?? 426 mIU/ml
5 weeks LMP 18 â?? 7,340 mIU/ml
6 weeks LMP 1,080 â?? 56,500 mIU/ml
7-8 weeks LMP 7, 650 â?? 229,000 mIU/ml
9-12 weeks LMP 25,700 â?? 288,000 mIU/ml
13-16 weeks LMP 13,300 â?? 254,000 mIU/ml
17-24 weeks LMP 4,060 â?? 165,400 mIU/ml
25-40 weeks LMP 3,640 â?? 117,000 mIU/ml
Women who are not pregnant <5.0 mIU/ml
Women after menopause 9.5 mIU/ml

"NB It is important to remember that these numbers are intended as a guideline only. They are not definitive and are just meant to give an indication of what can be an average hCG range. Every woman and her pregnancy are unique and what is considered normal for one may not be for another. If you have any concerns about your individual hCG readings then it is important that you seek reassurance from your health care professional"