TTC baby #4 with no luck :(

🦄_Sasha_🦄 • ❤ My miracle baby is finally here! 12.27.2017 ❤
Hi there beautiful ladies! 
I have 3 beautiful children from my past relationship, I am only 26, but my boyfriend & I have been trying for over 15 months to get pregnant; but my period seems to come every month. I guess I'm waiting till mid year to see if anything changes, if not I shall be going to seek medical help. 
How long did it take most of you to conceive?
Thanks in advance ladies xoxo 😘
Also how much sex is okay to have during ovulation time?