Tips on getting pregnant

Samantha • Been ttc for over a year now I had 3 mc in my life and no baby`s ttc #1 ant it is really hard sometimes I just wanna give up
I'm new here and I was wondering if anyone could help me and my bf have been trying to have a baby for 7 months now. At first we thought I was because my boobs have been getting bigger and my back hurts and I wAs spotting last month and my belly is getting bigger but I took a test Saturday morning and it came back negative my doctor put me on vitiemans a year ago please help me