Help!

Hi, I’m new here. My name is Kenna i just got married April 28, 2019 but I’ve been with him for 7 years. We have a son who just made 4 this December. We decided that when we got married we were going to try for a new baby. I was on the birth control shot for 3 in a half years just got off it in April before our wedding day. We have really been putting in work trying to conceive but we’ve have no luck. I decided to come here for some help! Also i don’t have regular menstrual cycles. How long did it take for you guys to conceive? What are some signs to look for besides discharge? Right it’s saying I’m ovulating this week but today i experienced cramps and a small bit of blood on my panty liner..... 😩😩😩