Had a period 6/8 had sex 6/24 then had a period 7/6 now experiencing lower back and abdominal pain and clear vaginal discharge and tingling nipples?

Pregnancy Sx. At age 34, occacionally a women will have two cvulations, i.e., two corpus luteum cysts both producing progesterone, which can mimic signs of early pregnancy . If your period which began on "7/6" was normal in length, it is unlikely that you are pregnant (unless you had sex on 7/20/14 or close to that. A serum pregnancy test done in about a week from now will give you an accurate answer.
See a MD. With the 7/6 period your last cycle was negative for pregnancy, but maybe not this one. Do a pregnancy test and if negative see a MD and get examined.