Weird vaginal feeling ?

Okay so I had my period around May 17. I was sexually active on May 22 in the night/morning. I got my PlanB the next day took my first dose at 3pm and the next at 3am. Then I got my period around May 28. Now is July 2 and I have been having these weird feelings in my vagina. Like is not itching but is like an constant feeling of wanting to pee or like someone is pounding it. Sometimes it does itch but not as much. I'm so confused and scared. I know I had my period after that but what if it didn't work ? Omg can someone please help me. This feeling is so hard and weird to explain.