I have not had my cat checked and she is pregnant, what are the risks?

My cat has been pregnant for about 45 days..now Ive looked up vets to see if there was some kind of treatment that i should be giving her and I haven't really been able to get an answer because the vets charge. So what I am asking is there a risk of complications or distilled birth? Also her mother was very small framed and only had about 2 kittens every litter, will my cat be the same or no? Also, sorry so many questions, um...ill be putting her on kitten food sometime soon and so Ill be preparing for her delivery. Really need some pointers on how to prep for this and also if there are risks. Please help my cat. Myra is her name.