It is very common in pregnancy to have gum and tooth issues related to the rise in hormones. It is recommended that you see your dentist more often while pregnant. Just make sure you tell them that you're expecting so they don't do an X-Ray on you. But for sure go see him and have it checked out! My gums have been inflamed my entire pregnancy and I'm 36 weeks along.
No it is common in pregnancy and needs to be treated... The majority of pregnancy toothaches are caused by sore gums which might be inflamed or infected and are referring the pain to the teeth. The effect of these conditions feels very similar to a toothache and can be extremely painful if left untreated... its not to say its not a real toothache but either way good oral health is VERY important when pregnant and yes you need to see a Dentist ASAP Good luck!!
It's not likely related to be related to your pregnancy. You need to see your dentist to find out what is going on.