Practically you are out of danger we can say however only confirmation can be given after 12 weeks, Be sure to practice safe sex for now and also confirm the source whether it is reactive or not.
Don't take mental toll on yourself if you feel agitated and anxious do consult some physician or psychiatrist.
Next Steps
Just follow the regime but I guess you have already completed the 28 day one so just be patient and follow good lifestyle like good diet and excercise and a test as you know after 12 weeks of the incident.
Thanks