Final Transcript matters much?

Hi guys,

I’m an int’l student who just got accepted to F&M in Apr. Long story short, I kinda got lazy after receiving the decision, slack a little in school and may be I’m getting somewhat lower GPA this semester (84%-85%) compare to my 1st sem GPA 91%.
I’m scared that may be F&M will withdraw the admitted decision when they see my final transcript, which would be available in late Apr. I haven’t committed to F&M yet so I think that there is a chance that they will do that.
Has anyone ever heard/experience such things before?