Hello

So I completed my tax filling by turbotax and since it's the first time for me to do, I had to send it to CRA by mail. But I mistakenly didn't track the mail so I don't know if they got it or not. I tried to login on CRA website with my CRA account but I'm still not be able to login, showing ERR.038. Should I just call them for making sure whether they received my tax documents?

Thanks in advance