My mate has the implant in her arm, she thinks shes pregnant, could she be?

her bf c**e inside her about 5 times, she had it a month and he c**e in her about a week later (when the leaflet says you can). when she gets home she, em, washes herself out in the shower too. she hasnt had any symptoms but her period is a few days late and she woke up feeling abit sick yesterday? help!