First Screening after LLETZ

I had a LLETZ Procedure in October 2017 for CIN 3 and positive HPV. 

I Was told I’ll have a smear in 6 months - but I’ve already had the invitation letter come through today. It’s only been 4 months, but is it OK just to go ahead and get it done because I’ve got the letter..? Or will they not test the sample if it’s not been 6 months...? 

I would rather just get it out the way anyway to be honest, rather than wait until April!