Sex - pregnancy

Cassie
Asking for a Friend!
She had unprotected sex 4dpo her periods in 7-8 days. She's been nauseous for over 2 weeks and vomiting for about a week (she had protected sex a month ago but their pretty sure the condom broke) her breasts are sore.
She took a test and it came up negative but she's worried about the unprotected round even though he withdrew (because of the precum) when should she test?

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