I had unprotected sex once with a virgin like a month ago. does that mean that im infected with a std? ( and alot of oral sex too)

Hard to say: I find a lot of variation in what some call a "virgin".If this contact had no sexual activity of any kind with any partner in the past, your risk from her is minimal. However, if you have ever had sexual contact with another partner in the past, you could acquire an infection that may show no symptoms and have it for years.

No: It does not mean you are infected - especially if she had never had a partner before you. However, you should be using protection for every encounter. Not everyone who says they are a virgin, is. STIs are very common, and can affect your fertility! Protect yourself every encounter. Good luck!