I’m really scared can someone please give me their opinion?

I had sex with my Bf, it lasted about 15mins. He wasn’t close to cumming and I’m on the pill (Yaz) I take it every night and I haven’t missed one day. It’s been around 2weeks. I’ve been feeling a little sick to the stomach but I have just started a new diet (cutting out all sugar and carbs) and ive been anxious because he’s been away with his family.

Could I be pregnant?

Edit: oh and I haven’t told my mom and we are really close so I feel extremely guilty so I’m not sure if that is adding to my anxiety which is making me feel sick... I’m just scared:(