does anyone want to get pregnant without trying?

I've been with my boyfriend who is my husband now for six years and we've always had unprotected sex. He's always use the pull out method to prevent pregnancy but I know so many women that have got pregnant by using the pull out method. I am so scared that I may be infertile and every time I get my period sometimes cry because I'm not pregnant. I know it is a dumb question because we are not actually trying but sometimes I feel like the best pregnancies that come up are the ones that are conceived without trying if you know what I mean.... like two weeks ago I had sex on my fertile days and and then a little later I started feeling some pregnancy symptoms. I even took an early pregnancy test that says six days sooner and it was negative. And today my AF just came so now I am feeling sad that I'm not pregnant....