It's only possible to feel symptoms once implantation happens, and the soonest this can happen is 1 week after ovulation. These however can also be symptoms of illness, poor diet, digestive/fluid intake problems, anything really. Even wanting to be pregnant can cause these problems.
There is no test that will tell a women she is pregnant if she though she got pregnant one week ago, it isnt enough time, maybe getting a blood test by a Dr. because it is more sensitive. It is not impossible to feel those things already, but it is also possible for those things to be due to other things. if she has an irregular period then those symptoms could be because her period is coming, those symptoms are also associated with PMS. It could be pregnancy and it could be something else. Wait at least another week and then take a HPT with first morning urine following the directions exactly, good luck!
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