Concerned with my 19 month old

Hello ladies, I’d like to hear other people’s experiences with their toddlers. Mine is 19 months and still doesn’t talk. ( I speak to him in Spanish, hubby in English, and daycare in French) so I’ve been reading that it could be normal for him to have a little speech delay because of being exposed to so many languages at once. he just says mama, dada, kaka for the longest time. (Not any sound, or animal sound either) This week he learned to say No, uh oh, and oh no! However, besides the speech, is that he’s very ROUGH. He hits most of the time, and he doesn’t feel any remorse! Even if I pretend to cry after he hits me, he laughs and continues… If I say NO, No hitting! Be nice. He still hits, he doesn’t give a s*** 😅 Not only he hits, he stabs his nails onto me, sometimes bites, he pushes other kids, etc. I had mention this to his paediatrician, however he did mention it could be due to frustration since he cannot express himself yet. Which I understand, but my son doesn’t even point at things that he wants. He just cries. Like I could ask him do you what milk? And he cries. It’s not like he would nod or anything… He was late in all his milestones. He just started officially walking at 17 months… Am I worrying too much? Is this normal at this stage? Bc all the nurses are telling me he should say 20+ words… which he doesn’t. And he should be able to point at things that he wants too. I’m just scared he could be in the spectre of autism. With adhd or something Pls let me know what you went through 😞 A very worried mama…