Thrush while pregnant? was your baby early?

Ka
Unfortunately I have been on several rounds of antibiotics & now have thrush. I have read it is highly likely to cause preterm labour. Has anyone had thrush during pregnancy & if your baby was early how early was he or she please? 
Also how did you treat your thrush? Did you use the cream with the applicator or just the cream on the "outside" GP said either was fine. What did your GP recommended? TIA