I can’t tell if this is the OCD or if I’m just terrible

Okay, so as of lately, I have been experiencing POCD. Which has been incredibly scary. This obsession flared up while I was having sex with my 28 yo boyfriend (I’m 27 yo F). I had an intrusive thought “he’s built like a child” (my bf is pretty “lanky” I guess you could call him). That thought sent me into a spiral of “am I attracted to children?”. That was about two weeks ago. Since then, I have had break downs about this theme. I’ve felt suicidal because honestly I can’t imagine a life where I would want to harm a child. I started Zoloft about 12 days ago and my anxiety/ocd has been spiked. Last night, I was feeling decent mentally, then my boyfriend started touching me intimately. He stopped after a few seconds and went back to his video game and I got on my phone. After that I guess I was “in the mood” but as I was scrolling on social media, I saw pictures of my old teachers child. I noticed that they looked like my ex from when I was 19-22 and I thought they were kind of cute. Then I noticed it said senior in high school, and they are 17. Which in the first pictures they did not look that young. Now I am absolutely freaking out because I am scared that I am attracted to teenagers because I was “in the mood” due to my boyfriend and having these thoughts about my teachers kid at the same time. I have always been very adamant that I don’t go for anyone who is more than 2 years younger than me because it just feels gross. I have been thinking about it for about 12 hours now and it is scaring me. My brain is telling me “it’s not as bad as the thoughts about younger kids that you were having” and also that I am “definitely attracted to this 17 yo child”. I cannot even tell what are my thoughts and which ones are my OCD at this point and I am so scared. I don’t want to be attracted to teenagers or any child at all. I know we’re not supposed to be seeking reassurance, but can someone please tell me if this sounds like my OCD or if I am actually just a creep.