Work and TTC

I am TTC and I am worried about how my job will influence that... I work as a uniform coordinator in a purchasing department. Most of my day is low key and at a desk, but I do sort through and send out uniforms. I work at a heavy construction equipment dealership, so the uniforms consist of heavy thick jackets, coveralls, and other items. Could lifting a box of uniforms cause many issues in the first week or two of pregnancy (the time where I might not know or be able to confirm pregnancy with a test)? I don't really want to tell my supervisor that in TTC, especially since I work with 3 other men who are very quiet and all about business... If something is too much, i ask one of the guys in the warehouse for help since I have a bad back as well, but I don't want to look incompetent. What do you think? Am I making it a bigger issue than it needs to be, or is lifting a box of 5-9 jackets going to be a concern so early on?  Any help is much appreciated!