Do you think I could be pregnant and when should I take a HPT? please help!?

I miscarried on 20 September at 5 weeks and 2 days it was the most horrible experience ever. My husband and I really want to have our first child... Since ovulation I have had sore , nausea, headaches and cramps.... Today I am 8 dpo and still have sore and nausea. I keep testing for pregnancy even though I know its too early but Im very anxious... anyone else in this position??? any helpful advice??? I really hope Im pregnant and cant wait to test again with my early detection test which can be carried out 4 days before AF is due.... I really hope these symptoms are real and not all in my head because I want this so bad!