No, a pregnancy wouldn't work at 1 week. If you do so, you may get a negative result. Given that conception has not occurred at this point, the hCG hormone is still not present in your body, which is the hormone detected by pregnancy tests.
Learn more: When to Do a Pregnancy Test? – Instructions for Use, Results & Accuracy.
Read the full article on: When Does Week 1 of Pregnancy Start? – Symptoms & Key Facts ( 59).

Zaira Salvador
B.Sc., M.Sc.
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV