Peeling off and stomach ache

After my not-so-nice sunburn I told you about, now I'm entering the itching-peeling phase, which I'm not sure I like a lot more than the other phase. I mean, I really prefer to feel itchy than in pain, but it's pretty unpleasant anyway...at least I'm starting to get a little brownish, instead of the bright pink from the beginning!

About my stomach, Sunday was really bad (I think I already told you that), with diarrhea and all (sorry!), but it has continue coming and going this whole week, not as strong as sunday, but yet, I've been having some intestinal problems that have me a little intrigued. Not worried, but curious. See, since getting pregnant I've had serious issues "going" to the bathroom, you know what I mean, so now, this "easiness" it's a little strange for me, unusual...but well, at least it will be useful when I go to the doctor tomorrow and have my stomach quite "clean" LOL!

This week I also had the "visit" of those brownish-pinkish-orangish CM I had some weeks ago. I was a little worried, but stopped worrying, I think it's definitively some "capilar fragility" I read about, or maybe just another symptom unique for me LOL.

Related to my "worries", I'm a little confused with counting the weeks. Now I'm like 12 ww+3 days, but I'm getting a newsletter (What to Expect when you're expecting) that's saying "You're in week 13". So if somebody asks me, I'm in week 12 or 13? because I know this is my 13th week, but for example, I'm 28 years old and 8 months, but I'm not saying "yes I'm 29"...

So that newsletter confused me a little, I even went to check on my EDD, but it was ok.

Anyways, my question is more related to knowing if I'm already out of the "risky 1st trimester" or not? as to stop worrying once and for all I mean!

Thanks!!