Hi, if I m not wrong this incident happened 3 months back, if that's so then I believe you should have started seeing some symptoms about infection majorly, also there r few
STD which take time to show symptoms and if you think not sure of ur partner status then will suggest you to go for screening tests to get clear idea.
If u want to further discuss about it then you can visit Dr near u or contact me. We can understand what's actually bothering u and account if required we can get necessary test done.
Please feel free to contact me if you have any further doubts.