Ttc with clomid , when shall I test ?

Currently on my 8th round 150mg of clomid, been a long and tough ride but hoping that maybe this time it's worked! 
Period was due yesterday ! But too scared to test just yet! 
Boobs are hurting a lot and increase in discharge but not sure if this is because of period ?
Unsure when to do a pregnancy test :/ ? 
Any advice would be really appreciated