If one has ARS, the symptoms come on a 2-4 weeks post infection and last 1-2 weeks. 15 week symptoms is not HIV.
i believe its too late for ARS symptoms but there are more informed people than me on this forum they can help you.
i was told this also by a friend he told me that ARS xomes 2 - 4 weeks after exposure and lasts for a maximum of 2 weeks and that 15 weeks is just to far away to be conected with ARS its probably another infection. but to be honest i dont trust this freinds judgment he claims to know everything i am sure i will get better advise from people in this forum.
For ARS it's too late.
If you are worried, get tested. You will get a conclusive result as 3 months have passed.