Levofloxacine in an antibiotic and it is not recommended during pregnancy
. It mainly causes the problem with the cartilage
developement of baby.
Now since your pregancy is in the intitial stage and there will be no cartilage development at this stage, I think this is not going to harm your pregnancy.
I suggest you to consult your doctor before taking any medication and also try to have regular check ups for the pregnancy from now on.
Thanks and hope this will help you.