Trying to get pregnant! Advice?

Carlynicole • - C
Hello all you beautiful ladies! 
As you can see from my title I am trying to conceive. Me and my fiancé have been having unprotected sex since we started dating. We decided that we want to have a family, we agreed we were in no rush and whenever it happens then it happens and we take it from there. We got pregnant once before but I misscarried at 14 weeks.
The past 4-5 months we've been having sex almost every day and every single time he has came inside of me. I also have been taking chewable prenatal vitamins since the beginning of April.
Yet somehow I still am not pregnant. I go for long walks every day with the dog for some exercise. I get lots of sleep. I eat healthy for the most part... I do have a caffeine problem and I do drink soda every day..
Also I've been trying to get into to my OBGYN but have been having trouble scheduling with my Doctor.
Do any of you lovely ladies have any tips or advice for helping me to conceive?? I have 3 days left in my fertile window and I want to be a mommy and start my family with the love of my life more than anything.
Please help :(  I'm feeling very doubtful and discouraged that after months still no baby :( 
Thank you! Xoxo