I just want to scream!!!!

I just want to scream!!!!!! Why cant i get pregnant already!!!!!!! Im on fertility pills and progesterone pills,im taking prenatal vitamins every morning ,i have lost some weight,using digital predictor kits ,ive gotten some positives but NOTHING!!!!!!!! Why???????? We didnt even have to try for our son ,it was a few seconds late on pulling out and BAM!!!!! I got pregnant!!!!!! But now we are actually trying to get pregnant its like it aint happening!!!!!!! I just want to to scream and throw things ,when i start my period!!!!! WTF !?!?!?!?!