Not if you keep records - you can trace where the money has come from, so I wouldn't worry - how you fund your business is up to you and your credit cards are your credit line - you will be paying for the privilege but even at 1.4% on say £5,000 is only £70 - do you really think an O/D will be cheaper 1) paying for the facility whether you use it or not 2) monthly interest and 3) would the bank even extend £5,000?
Go one stage further, get two cards - draw £5,000 off the first, then balance transfer to the second on 0% for 18 months - 2 years.