Tooth still sensitive after root canal?

I started to feel sensitivity on a tooth when I would bite down a couple days after I had a filling redone there. I thought I broke it but the dentist couldn't find a break in the x-ray or visually but he did suggest a mouth guard. I ended up getting a root canal done but the tooth is still sensitive to pressure. I had sharp pain when biting the morning after but it's gotten a bit better after that. Is it normal for a tooth to still be sensitive to pressure after a rood canal? Will the sensitivity resolve after I get the crown? It's the weekend so I can't ask my dentist