Can anyone disprove....

Heather
That spit kills sperm? I see so many different answers I'm not sure what to believe.
​Also, AF due 8/10... It may be too early for symptoms, but I have none and I normally don't have any symptoms before AF anyways besides a bit of PMS, bloating and an increase in appetite... Is anyone similar to me? And if you have been pregnant before, have you not had any symptoms or did you all of a sudden develop symptoms? 
​Any info is appreciated ?