I want a Baby, but can't get pregnant. Please help.

Hi Ya'll,
I'm new here and me and my husband have been married for a year and a half and we want to start a family. We have been trying to get pregnant for about a year now and have not had any luck. The past few periods though have been weird and not normal but when I test I am negative every time. I seem to experiance some pregnancy symptoms. I have slit cramping (where I usually do before my period) but its not at the right time that it usually comes. This last period it was 1 and 1/2 weeks before my period came. Then my boobs hurt a little and my nipples bother me. Sometimes I feel wet but when I feel I'm very dry. When my period comes (I am irregular never now when its coming) all the symptoms go away but then come back when my period stops. There was a fews days that when I woke up in the morning I was very sick feeling but never got sick. I also can't seem to bend very well at the waist because if I push on my tummy I feel sick. I don't know if maybe I might be pregnant or is it that I want it so my mind is playing tricks? What should I do if I'm not? How can I get pregnant soon?