Using the clear blue monitor and having first peak on day 21 PLEASE HELP?

This is my first month using clearblue monitor. I had 3 days of low and 18 days of high then on day 21 and 22 I had Peak which means I ovulated. Last month my cycle was 30 to 31 days long. Is this normal I'm on day 24 now and I'm back to low on the monitor. And since I ovulated so late will that cause problems in conceiving. On the high days I bd on ever other day besides the two days before the peak. I bd twice on the first Peak day.