My boyfriend and I havent had sex in a month. We have always used condoms when having sex. 2 weeks ago, i noticed a sore on my volva. A few days after that a lymph gland on my groin was swollan (only on my right side) it didnt hurt or anything. However, I have had an usually amount of discharge. Then today, when i woke up and went to the bathroom, a big, gel like, thick discharge came out. Is it an STD? If so how did i get it?