Really Bad Jaw Pain

Hello ladies! I am 4 weeks and 4 days pregnant (including the two weeks before conception which is very confusing). In the past three days I've experienced severe jaw pain on my right side. It hurts to open my mouth very wide, but taking is ok (thank goodness). I heard this is normal. Have any of you ladies got this? I couldn't sleep last night due to it, but I can't seem to get to sleep anyway. Hope you're having a lovely Sunday xXx