Clarification: Get tested at least 28 days after your last dose of PEP.
So, a couple of things. First, you did have a risk of HIV from your exposure you mention here but know that it is low. A one time exposure of vaginal sex is less than 1 percent chance of transmission. And this wasn't a high risk person. This was your ex boyfriend. The chance of his being HIV positive all of a sudden are pretty slim. So risk was very small. You'd need to test at 28 days and beyond and expect it to be negative. SEcond, you don't qualify for pep. That is reserved for if someone had exposure to someone KNOWN to be HIV +. Pep is very hard to take with lots of side effects. You don't need pep. And third, the rash on your leg has nothing to do with HIV. Get tested at 28 days and as mentioned, expect it to be negative.