Scared about sex

I have a boyfriend and we already have 2 years and 3 months together, but when me had like 9 months we tried to have sex in a pool. I know it was a bad idea, but in that moment we were not thinking so... After all that, days later, before my period came, he told me that he was scared because he thought I was pregnant because the "pre-semen". He didn't cum, but he thought the pre-semen came out in that moment. I was so scared, I didn't ate all that days, I got a hormonal disorder because all the stress and one that. I got my period on the day 28 and then we calmed down. Now he tells me he is ready to try again, but I'm so scared to go through all that again and I want to try , but I'm too scared. Should I try again?