My rheum is taking side effects too seriously?

Diagnosed 5 weeks ago and have had four weekly doses of MTX at 15 mg. At my follow-up meeting with rheumatologist today she asked about side effects. I told her that I had some stomach upset and fatigue on first day of MTX, and she said that she wanted to add leucovorin( in place of folic acid ). She also said we should wait to see how the leucovorin works before increasing my MTX dose to 20 mg.

I was taken aback. I told her my side effects were manageable and I want to get to 20mg as quickly as possible. Her argument is that we want to get to no side effect for MTX before increasing dose.

As a compromise she said we'll re-assess after two weeks with leucovorin. And if all ok go to 20mg oral. If not ok consider injection

She is 100pc supportive and available and thorough. Shes part of the UCLA rheum team. I trust her but surprised she feels the side effects is more important to deal with -rather than getting to next dosage level.

I'm seriopositive with quick onset of symptoms. My physical shows that I have had some positive response to MTX and -that agrees with my personal pain/function assessment. But I've got a way to go and anxious to get going.

Any thoughts?