Change employer while H1B processing has begun

[StudentOnOPT]

Hi,

 

I am currently a student on F1 Visa. I will be graduating in May 2018. I have received multiple offers from different companies. I had accepted one offer back in October from Company A. Now, they have started processing my H1B application. I am supposed to join them on June 18th 2018.

Recently, I started interviewing with Company B, which has been a dream company for me. Now, I am worried, if I get an opportunity to join B, how could my H1B application with A affect this? What should I be worried about?

 

Thanks for your time