I never had any luck with the cheapie ovulation tests. The clearblue fertility monitor is fantastic as it monitors your oestrogen as well as your LH so it tells u when your peak days are & the second peak is usually ovulation day (I get the twinges on one side & CM so know this second day is definitely the ovulation day). They are expensive tho...bought mine online for about $150 from US. I think u can buy a cheaper version, which is just the sticks (same brand) for around $20 which produce a smiley face when u are ovulating. There's maybe 10 in a pack (so good for 1 cycle). But takes the guess work out as u get a smiley face or u don't. I'm not 100% about the details, but this might be a better option to look into. They sell them at pharmacies & maybe even Woolies/Coles.