Need Some Help With TCC..?

How many times a day should I bd while ttc? And what are some positions, other than missionary, should I do? What other form of lube should I use besides pre-seed (because it is not sold where I live)? Please help, I have been ttc for 6 months now..first time it took me 11 months to conceive, but I had to abort very early in pregnancy. Thanks ladies