My husband and I just purchased the Clearblue Digital! I took my last birth control pill in October. My next 3 periods were very similar as to when I was on the pill. The 4th cycle after being off the pill I got my period 4 days early and the 5th cycle I got it 4 days late. I thought I was pregnant and was disappointed when my period came on the 5th day.  We decided to give ovulation tests a try! This one has good reviews and is easy to read! Hope this helps!Ali