I'm 16.5 weeks and I'm still very tired, but then I'm still on anti nausea medication and still throwing up most days so that is probably part of it......
When has it gone away in your other pregnancies? I would think checking iron levels etc. especially if it is lasting a lot longer than normal, but looking at your signature I imagine you have a pretty full on day and that combined with being a few years older than when you had your last baby is going to have an impact on your exhaustion level. Be gently on yourself