Are these early symptoms of pregnancy?

Hi everyone. 
So I got my implant taken out on Monday, and have had unprotected sex 4 times since. This afternoon Mum was making beef casserole (one of my favourites) and I couldn't stand the smell of it, and I've spent the rest of the afternoon curled up in bed feeling nauseous and uncomfortable. Has anyone experienced this before? Any advice would be great :)

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