Pregnant after period?!?!

Kameelah • 🌻 Add me on Snapchat: colormekae
Okay so this isn't about me but I'm trying to help a friend. She had sex with her boyfriend and she said a few days after she got her period, but now she's experiencing spotting and she said she used to feel nauseous and she urinates every 30 minutes. I'm wondering if a person could be pregnant even though they've already had their period after sex??