Hi no need to worry. My fiancée had her medical at SLEC on June 25th and 26th during heaviest days of her period. I was especially stressed as her interview was on June 27th. It used to be that St Luke’s would not let you take medical during period but that changed in 2017 I believe. The only issue was that my fiancée had to give a urine sample twice as the first one had too much blood in it. Everything turned out fine and she passed her medical, we got her results at 10:30 Pm on June 26th, went to USEM for 6:45 am interview on 27th and she passed.