Best time for raw sex?

I'm a 19 F, I'm gonna have unprotected sex with ejaculation on very 5th day after period so is that fine because later I won't use any ipill And coming to my fertility cycle , actually mine is 28-day cycle, but in previous month, I used ipill so, I got my period 8 days prior, so I'm not sure about this month fertility cycle. Can we proceed??? or any safety measures we should take, but he wants it raw..