hiya! Dont know no if this helps but im pregnant and iv continued getting my eyelashed permed throughout whole pregnancy!! Iv never felt it could be particularly harmful, ur only working on the eyelashes!
one thing i will say is that be careful when the client is getting up off the couch - hormones can lead to increased / decreased blood levels and can lead to feeling lightheaded! And especially so after lying for so long!!
Im also a trained beauty therapist and i would continue to offer service but id get client to sign a disclaimer / and or seek medical note if underlying health issues or health issues that risen during first trimester, or any problems in previous pregnancys!
Hope this helps!!