I kept hearing my own voice in my ears whenever I talked during my pregnancy (sounded like echo) .. lasted from ard 1st to 2nd trimester... but I didn't relate it to my pregnancy until I saw your post. Don't know if thats what you're experiencing. My LO is 3mths now and I don't have this problem anymore .. and I forgot when did it stop haha.
Probably not related to pregnancy, you can check with ENT doctor.