Anyone have difficulty getting pregnant in their 30’s?

I’m turning 33 next month and I already have a 12 year old son and 10 year old daughter so to say I haven’t been pregnant in awhile is an understatement . Neither of those pregnancies were planned and I was quite young . I hadn’t thought of having another child since my divorce a few years ago but knew I’d be taking that chance my leaving my ex that that may be my last chance for another kid. I made amends with that and moved on . My last serious relationship was a few years long and we both had children from our previous marriages and were content with our 4 kids as we had planned on getting married and having a life together — that’s not how things worked out though.

Now I’m engaged to an amazing guy whose doesn’t have children but Is fantastic with my two kids and we are seriously considering trying for a baby . I’m just in my own head now that I would be trying for one it won’t happen and that maybe my fertile years are well behind me .

Any advice or personal experience welcome ! Thank you