How much do you want a child? If I were in your situation, this is what I would ask myself: do I want one so much I'm prepared to do it alone? Do I want one so much I would be prepared to have fertility treatment and operations with no certainty that it would work? Would I consider fostering or adoption instead?
As the majority of people on here say your age is fine, I'm going to put a different point of view. I'll say from the start, I would make all the same choices again.
Started trying with DH at 34. DH and I were both eventually diagnosed with subfertility issues. After several ops and on my 3rd round of IVF I had my DS at 39. After 1 FET and 1 IVF I got pg at 41, had DD at 42.
DS is now 7, I'm nearly 47 and he has preverbal autism, SPD and we're having him assessed for ADHD. He is very sleep disordered, he smears and is so challenging I can't do something as simple as park outside a shop (Blue Badge), go in and purchase something, and get him back in the car without there being an incident which strangers step in to help me with. I haven't been able to go back to work. DH and I's relationship is under huge strain and my DD does not have the childhood I would wish for her. But we do also have good times. I think of things I can no longer do wistfully, I worry about the future, but I wouldn't want to be without my kids.
Everything I have described is age related. Someone will be on here saying the stats are hundreds of years out of date because some old stats were used for something a while ago. Lots of stats show that statistically, it's much more likely (for both men and women) to have sub-fertility in your late thirties and for any child you have to have SEN. Fertility clinics will tell you what the stats for success are past 35 - they go down. Fast. 15 years ago your chance of a pregnancy at 40 at a really good clinic was 1 in 125 per cycle (at 35 it would have been about 1 in 4 at that time). It's now about 1 in 7 because they have improved the techniques so much. You can manage 2 maybe 3 cycles a year at a cost of somewhere around £5-10k each (I think of DD, now 4, as the £7000 baby). If you fall pregnant naturally your chance of a miscarriage is around 1 in 5 at 35, by 45 it's 2 in 3 (rough stats from various sources).
I'm perimenopausal and the last thing I want to be doing is running down the high street after a much faster child having had to abandon an iPad and my handbag in his mobility pushchair (which two nice ladies brought back to me when I'd wrestled my child back into the car). This was 2 weeks ago and I've promised myself I will not try this again. Ever. My life is exhausting (but I really love my kids).
If you're still up for it, go for it. You may be one of the lucky ones who it all works out for, but know what you'll do in advance a) for support if you're doing it on your own and b) if you hit infertility. Consider what your plan B might be - what life would you make without kids?
I think 38 is absolutely the right age to ask yourself the really hard questions to give yourself the best chance of finding an outcome you can live with ten years from now.