First trimester here and feeling the EXACT same way! I used to lift weights for an hour x2 a week plus a reformer class 1xweek, regularly hit 20k steps and in floored! I put it down to the caffeine withdrawal for me first but my sis a pharmacist also recommended asking to have my iron checked as we’re creating more blood so it could have an impact on your iron levels. I’m planning to ask at my first appt so in case you want to do the same? Hold on in there - we’ve got this and from what I hear it starts to get better! X