Assuming you have supposedly-perfect 28 day cycles with ovulation on 14dpo, no. Theres no way you got pregnant from dtd 8 days before then.
In this case, likely what you are feeling are the very normal pregnancy-like pre-AF symptoms we all get when the thought that we could possibly be pregnant enters our heads. (This does not mean you are crazy but very much normal, pretty much every woman is the same that if she thinks she could be pregnant she can find a lot of symptoms to go with it even if they are symptoms she usually has but overlooks most cycles.)
However, if you have shorter than 28 day cycles you could possibly ovulate soon enough... for example if you have 26 day cycles, with 16 day LP (very unlikely) you could ovulate on cd10... which would be 4/5 days after you DTD in which case you could have possibly gotten pregnant.
In this case, assuming you WERE pregnant (and DTD on 4/5 days before O gives you a less than 30% chance of conception... 30% is what we have if we DTD the day before O) then testing Monday should be pretty reliable.
However, I suggest just waiting until Aug. 10th, one calendar month after your last AF and if AF does not show up, then test.
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