So worried 😔

21 years old I had a baby before but lost him before I could take him home ever since then I’ve healed but I always feel deep inside that I won’t feel as happy if I don’t have another baby .. me and my boyfriend have been trying for three years still nothing im just ready to cry idk what’s going on or how I should do this just to at least rule me out as the reason I can’t conceive idk if it’s me or him or something we are not doing well it’s hard to work this calendar out sometimes my period can be irregular I just can’t keep up what should I do ?