Friend Help ...

My friend, had a rough time with her bf. She feels stupid but it happened. Anyways, she recently found out she's pregnant, but she had sex with both guys . Guy A, does steroids, told her his sperm is bad. Guy B is super healthy and great sperm. She thought she was 4 weeks 6 days, when the baby showed 5 weeks 6 days. Does that mean she ovulated sooner? Her periods are irregular, 36day cycles, and she though she ovulated on the 16th. She wants to know, since Guy A sperm is basically bad, would Guy B have gotten her pregnant? She had sex the 8th with guy A and the 9th with guy B. If she is this far along than she ovulated the 9th and had sex with guy B on the 9th. Would it be a better chance of Guy B because she had sex on the 9th or would that sex with Guy B push Guy A sperm closer ?