Opk results

Ok so I bought the clearblue digital opk and today on CD 10 I got my positive smiley face I'm super excited.. I think it's earlier than usual tho my cycle can range from 24 to 28 days.
My question is what's the best time to hav sex when u gwt the smiley face?? I hav 3 Boys and I wud really love a daughter but this is our 3rd cycle of trying and I'm a bit worried that I'm not getting preg as I'm stopping just as we get the positive opk is there anything at this point in cud do to improve my chances of conceiving a girl as I promised myself I wudnt sway again after my last baby was a boy.... I didn't sway wi supplements etc more wi the timing x

its a common recommendation to have 1 attempy once you get a + opk. good luck!

Thanx we just dtd tmi - 3sorry so here's hoping we get a good bfp this month :) xx