Uncomfortable having sex in first trimester?

Okay so my poor boyfriend started a new job that requires him to go to out of one training for three weeks, mon-fri and he can comr home on weekends. This morning he left for his third week. I feel awful because last Thursday I found out I was pregnant. Due to this schedule and me being out of town last weekend, we haven’t had sex since the weekend of the 15th of April. And this morning I just sent him away for another week after a failed attempt last night😞 Friday and Saturday night I was just crampy and not feeling well, alone with being so tired. Last night we tried but I could not relax for the life of me, I was clenching so hard I was practically pushing him out. I’ve been so concerned with what I do because I’ve never been pregnant before and I’m only 5 weeks along so I have a lot of fears in the back of my mind. I want to make a healthy baby and for some reason my anxiety convinced me that having sex could possibly cause an issue. I haven’t even had a scan yet so I’m totally in the dark and don’t even know if it’s growing properly yet.

Has anyone experienced this fear😞 I feel awful for my boyfriend even though he reassured me, I just worry that this feeling of not wanting to have sex won’t change