I may have made a mistake on my state tax return? what should i do?

i filed my taxes in march and in april i received a letter asking for more documents. one of them is a proof of rent paid, but the rent was just cash paid to my mom as rent when i stayed with her, so there was nothing i could send. i just bought my first house last year and did the best i could as far as the tax info etc. but i have never done it before and had no help so its possible i could have made mistakes. i used turbo tax. its now june 15th and i havent received my taxes and my status on my taxes says pending manual review. what does this mean? should i amend my taxes with a tax place or something to make sure they are correct? will i get in trouble if i made mistakes on them? i already received my federal return like 6 weeks ago. the status on my state tax return also says it should be completed july 18th, but im nervous i made a mistake and will get in trouble if i did? any advice?