It really depends on you. You have to make sure that there will be no pregnancy issues first and that you are physically healthy.
Welcome! Are you expecting? As far as how many times you can have sex in a day, unless there is a medical issue or complication that you are having, it's really a personal preference and more about your comfort level, as far as how many times a day you can have sex. It's probably a good question to bring up at your next appointment with your doctor, if you are concerned, as they will know your medical history and be able to give you an answer that is best for you- each pregnancy and woman is unique so it can't be a straight "people can have sex X amount of times during pregnancy" type answer.