2 possible dads !? Opinions

Long story short my friend sent me this and there are two possible fathers involved. She is for sure she ovulated on September 1. Guy in purple has been taking anabolic steroids for over 11 years and guy in yellow has not. She tested for pregnancy everyday from the 9th of september and didn’t get a positive until September 13 which was faint but now she’s been so the doctor and is exactly far along by ultrasound calculation as any calculator on the internet. In your opinion, knowing that steroid misuse can cause male infertility, who would you think would more likely be the father in this case? She will be having a DNA test done while pregnant either way.