I cant conceive i need advise on what i should do

Me and my boyfriend have been tryin to conceive for the last 8 months like sometimes we would have sex on my period or right after i come off....itz got to the point he has asked me can i get pregnant??? Or what is wrong with me?? Im jus thinking like i have a 5 year old daughter of course i can get pregnant....im gettin to the point i jus wanna say forget it....im so tired of negative test....and itz like when he cums inside me when he pulls out itz like everything falls out too i kno itz tmi but i really need help u guys i just dont know what to do anymore