Sona cranberry capsules for cystitis?

[Calcifer]

Hi all, I am getting the first grumblings of cystitis and usually take Sona cranberry capsules. I checked online and the manufacturer said they were fine for pregnancy but the bottle I have says to check with doctor...

Since I've popped about six now, I am wondering if I've made a mistake. Anyone have any feedback? They contain vitamins C and E...