Aug 30 (Reuters) - Britain"s Johanna Konta said on Sunday she is still not sure if she should have taken the COVID-19 vaccine despite having to pull out of the Tokyo Olympics after a positive test affected her preparations. Konta, who won the Nottingham grasscourt title in June, was forced to withdraw from Wimbledon a day before the Grand Slam got underway when a member of her team tested positive for COVID-19. The 30-year-old then tested positive during her self-isolation and said COVID had affected her both physically and mentally. "It was a combination of feeling quite ill so I was sleeping or just existing for a few days," she told reporters ahead of the U.S. Open, which begins on Monday. "There was also a period there where I had to work through my own feelings of injustice at all of it, like: "Why now?" sort of feeling. I needed a bit of space and a bit of licking my wounds." When asked if she regretted not taking the vaccine, she said: "I don"t know, I"m not too sure." The Briton also said she did not want to be drawn into an argument about COVID-19 vaccinations being mandatory to play at certain tournaments. Konta"s compatriot Andy Murray has said players travelling around the world had a "responsibility" to get vaccinated. "This is a tricky thing to talk about because it"s a very inflammatory subject and there"s no real right answer," Konta added. "I don"t want to talk about it because I wouldn"t be able to get my point across without it being a case for argument." Konta returned to action at Cincinnati earlier this month, falling in the first round of the tune-up tournament for the U.S. Open where she plays Kristina Mladenovic in the first round.