Based on everything you've said, I'd definitely get a scan. We have very similar stats and timeframes. I was diagnosed in August 2018 with 1b1, it was about 2cm, no lymph nodes involved. I'm in the US so I got a radical hysterectomy within 2 weeks, but they opted not to do chemo/radiation at the time, said no further treatment which later recurred. At my 1st post-surgery checkup in Nov 2018,it was "normal" but 1 month later, I went for a 2nd opinion which found it. Mine grows fast I guess. From then, I went to get treatment at a different cancer center, the best one in US in Houston. Luckily, they don't mess around and my insurance is also very good so they approve anything my dr asks for.
Given that you still have your uterus, and it's adenocarcinoma, it develops in the glands way up in the cervix and that's why one of the symptoms we had initially was the clear discharge. I remember it well, you pee, then a blob of clear discharge falls out. Mine had no smell at all so I wasn't worried but still, I got it checked out coz it was unusual. Plus I had a tiny bit of blood at the tip of my sex toy a couple times so I went to the doc. A pap smear could be totally normal unless they get the tissues all the way up the cervix and even then, depending on the location, maybe not.
When I had my recurrences, especially the 2nd one in 2020, a pelvic exam was totally normal, the dr couldn't feel anything. And since I had a hysterectomy, there was no discharge. But, the MRI and PET that I got clearly showed there was a tumor there. I guess it hadn't yet developed into a palpable tumor you could feel. But I'm pretty sure if I still had a uterus, I would have had other symptoms like a discharge or some bleeding.
So, yeah definitely get a PET scan. You must insist on it. If all else fails, pay for it yourself. Adenocarcinoma can be a bit trickier than squamous cell and needs to be agressively monitored so you can catch it as early as possible, including recurrences. On the other hand, because you had the radiation, the discharge could also just be related to that and not a recurrence. So I'm hoping that's the case.
All the best!