Can pregnancy tests detect pregnancy?

Patient's question:

Detailed medical condition and consultation purpose: Hello doctor
I had my period on December 1st and it ended on the 8th. Then on the 13th, I used an ovulation test kit and got two red lines. After that, we had intercourse. We had sex every other day from ovulation to the end of the cycle.
Doctor, if this is the case, can I take a pregnancy test today, the 25th? //?/
If it's still too early, then when should I test?
Should I wait until my period doesn't come before testing?
??

Doctor's answer:

Hello, generally, a home pregnancy test using urine can provide a relatively certain measurement value around 20 days. At two months, it can clearly detect whether you are pregnant. There are also many early pregnancy symptoms, such as breast tenderness and pain, a string-like texture when touching the lower breast, and a noticeable increase in breast size, which can persist into the later stages of pregnancy. Most people experience nausea, vomiting, and a loss of appetite. For blood tests, it takes at least 30 days to detect pregnancy.

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