Tmi please help not sure what to think

Okay so my boyfriend and i have been together for awhile and when i have sex with him i notice it leaves a bad odor like his semen smells foul. Ive never had that in past relationships. He also told me he has a lump in his testicles. Ive had two kids and got pregnant immedietly with both from my ex. But with my new love not getting pregnant is this connected??