<human>: Give me the gist of the text in a nutshell

Hi reddit. This isn't as serious as many posts in this sub, but I'd love to get some outside opinions. Also I'm sorry if this isn't the right place for this question!

A little over a month ago I went on a trip with my boyfriend, during which I got a tattoo. It is of a tree, above my ankle bone, and has personal meaning for me. I don't regret it at all, and am happy with it. 

I didn't tell my parents about it because they are very conservative, traditional people. Growing up, I got lots of lectures about how you shouldn't do drugs, have sex before marriage, dye your hair, get lots of piercings, tattoos, etc because these were "bad" life decisions, but that they would still love me if I made those decisions. I've made several of these "bad" decisions, but most were easier to hide as to not cause my otherwise very loving and supportive parents distress. We have a good relationship, and I just keep the stuff I know they won't like to myself. 

I live with my parents still because I'm still in university, and I haven't been explicitly trying to hide my tattoo since I got it, but it's still winter where I live, so I have been mostly wearing pants. They have not noticed. I am dreading the moment when they notice.

My plan was to just wait until they noticed, and then just explain that it was a choice I made during my trip. However, I am going swimming with my aunt, my mom, and my 3 and 5 year old cousins tomorrow, and I'm pretty sure my mom is going to notice then. 

Should I just tell her before we go? Or should I just wait and see if she notices like I originally planned? 

Thank you for taking the time to read this and for any advice you may have!
<bot>: Got a tattoo a month ago, didn't tell my parents, but my mom will probably notice when we go swimming tomorrow. Should I just tell her or let her notice it on her own?