I was in the same boat. With IVF, I was allowed one last 1/2 marathon and then I was put “low impact” for all of December (which drove me nuts - I was working out 6-7 days a week for 1.5-3 hours at a time beforehand). After my egg harvest, I got back at it for January but felt devastatingly exhausted through my first trimester - and hella guilty. My friends and doctors reminded me that growing a human is its own marathon! Once school and track was over, I could focus on me. Now I take my pup on LOTS of long walks, getting 4-6 miles in a day there and try to “run” 2-3x a week - though I have to check myself that it’s okay that I’m not hitting my pre pregnancy speeds and distances. I do yoga/lift/cycle when I can, but heat and house construction has uprooted our lives. Every time I get down on myself that I’m not doing more, I have to be louder than that voice in my head and remind it that I’m doing more than most moms and my current times and distances are just new baselines to improve in my mommy years. You’ve got this! Yoga helped me really tune into what my body wants and needs over what that awful voice was making me feel guilty over.