Another baby??

Hi imperfect mums!
So I have a dilemma.
I have two gorgeous children, one of each sex but I’ve always had a longing for a third. I’m 39 and my youngest will be going to school next year. We had put off a third for a few years now due to my brother getting married overseas last year, I didn’t want to travel with a bub or being pregnant. I guess we just got along with life when we got back and occasionally we’d mention it but 2 weeks ago hubby said what do you reckon about trying for a third?? All these emotions of excitement came flooding back but then I thought am I too old? Is it too much of a gap, my two are only 3 years apart. While I was deciding this I have since found out that my brother and his wife, who didn’t want kids, are now pregnant. Now I feel like I’ll be trying to show them up or something. I just feel like we’ve put 2 years of our life on hold to afford to go overseas and to pay it off and now we are in the position to maybe have a third but we will look like we are trying to take the light from them. I am truly happy and excited for them both but as I was packing up my baby stuff to pass on to them I could help but feel sadness. I know I’m incredibly fortunate to already have 2 but does this feeling ever pass?? Or do you have regrets of not having that baby you desperately wanted??