Burning down there

Kristen • Ttc#3. Currently have a 6 year old daughter and 19 month old daughter. Married to my husband may 2014.
Today I'm cd 17. I have had a positive opk on cd 14 16 and 17. Yesterday and today had a lot of ewcm. We bd last night. This morning I am having a lot of burning down there like the start of an uti. Does anyone else get this and not have one? Last time I felt like this the dr said I didn't have one.