Pregnancy... First Time Posting

Naomi
Hi ladies, I've been trolling quite a few posts for some time now and have related to lots of things in this and I'm honestly glad for this app... but I wanted to post because I'm embarrassed and honestly in need of advice or something 
I'm 26 yrs old, I have a 7 yr old boy.. I haven't been on birth control since my son was a year old ... I'm trying to get pregnant with my boyfriend and we have been having unprotected sex now for 4 months and still nothing ... my periods are very heavy and lengthy lasting anywhere from a week to two weeks or I'll have it twice a month ... I'm kind of at a loss right about now... I don't know what I'm asking but if you get where I'm going with this .. please comment