Phantom pregnancy

Has anyone else been wanting a baby so bad for so long that you actually feel pregnant? Sometimes It will be like 3 weeks after intercourse and I’m positive that I’m pregnant, I’m sick in the mornings, some smells make me sick, I have cravings, I have mild cramps and my brain is soooo positive that I’m pregnant but then when I do tests it turns out I’m actually not and then Mother Nature makes an appearance a week or two later. My mother told me that sometimes when people want one so bad they actually start to believe they are....opinions?