Can I supplement my hrt tablets with gel?

Hi ladies, I’ve been on Elleste Duet Conti for about 2 years now. For about 95% of the time everything is normal for me again, no joint pains etc, however I notice kind of midway through my cycle that pain has crept back into my index finger (cant really do anything with it, it hurts that much to touch) my left hip & lower back ache really badly and all of my teeth hurt. I wondered if I could stay on my tablets as I am happy with the results of being on them, but wondered if I could supplement the tablets with some estrogen gel at this mid cycle point?
Its very hard for me to know where I am in my cycle as I haven’t had periods for the last 17 years due to a womb ablation. So I don’t know when this pain will occur until its there.
what do you think I should do?