Speech delay ?

I’m curious if anyone else has gone through this. My daughter just turned 22 months old. She was slow to pick up on saying a few words. She only says a handful of words still .. well maybe two handfuls. She has a hard time expressing herself to us. She is constantly throwing a fit and throwing her head around hitting it on thanks. She is also starting to hit me and my husband because I think she can’t tell us exactly what she wants and it’s too frustrating for her. Our pediatrician talked about doing the birth to three program a few months ago if I was interested but she doesn’t really think anything is really wrong with my daughter just thinks she has a little delayed speech. Is it still normal at this point?? I mean she’s almost 2 years old I am concerned I really don’t know what to do. I also have a 3 month old and she has been saying even less words now that her sister is here. Worried mama.