Conception related questions

Hello Everyone
I am Trying to get pregnant . My period was on June 26 with 4 days bleeding, 30day cycle.
July 6 - CM :sticky, not egg white, LH: -ve
July 7- CM :sticky,  egg white, LH: +ve 
July 8 - CM :sticky,  egg white, LH: +ve 
July 9 - CM :sticky,  egg white, LH: +ve 
July 10 - CM : not sticky,  egg white, LH: +ve 
We are bding all 4 days twice a day morning and night starting from July 7. Can someone tell me why my LH surge is still high and when did I ovulate. I had read some post if LH surge is continously high it might be a sign of pregnancy, is it true??