Need Advice Ladies

So I’m on birth control keep that in mind and my boyfriend has never finished in me. I ended my period exactly a week ago and the past 3 days I have had burn and irritation down there and I constantly have to pee and yesterday there was some pink discharge. I think I just have a uti and I’ve been drinking tons of cranberry juice and water and there has not been anymore blood but still uncomfortable down there. I have an event Saturday and I need it to stop but I don’t want to take any medication. Any tips?? Do you think I could be pregnant??