Trying to conceive

Okay so I’ve been on and off of birth control for the last 4-5 years, and with the pill I always forget to take them. And with the shot I don’t have any complaints. I think I’ve been on the shot more than the pill. Recently I started the shot in December of 2017 and I didn’t go to get my second shot in March this year. So I’ve had a period at the end of January that lasted almost 2-3 weeks. 😔 And now I’m back on my period since March 31st after not getting the second shot on March 13. June 5th made 12 weeks since it’s been out of my system.Do anyone think this is normal and am I okay to start ttc??? PLEASE HELP!!!!