What Causes Delayed Pregnancy Along With White Vaginal Discharge?

Okay so I ve been having some female issues for quite some time now, I first went to the gynecologist and they told me my ph level was down, my first question is what does that mean and how did it go down and how to prevent that, second question, I don t want to be so blunt about it, but at this point in my life I feel I should have been pregnant by now, I ve had sex multiple times before, after and day of my ovulation and I m still not pregnant, this month I felt allot different and I thought I was because I had my period from the 1st to the 5th and then had another from the 12th to the 14th, and I ve been having allot of white or watery discharge and my left lower abdomen has allot of pressure and if I sit down a certain way it hurts my stomach in that spot, so I don t know what to think of that, and wanted to know if there s a way to find out if I can even have children, last question is after I have sex I pretty much leak out all the seamen, like it comes out like water and ill leak like every 20 mins the same, why is that and what causes that?