Hi, I Am Currently 18 Weeks Pregnant. This Morning, I

Hi, I am currently 18 weeks pregnant. This morning, I hold in my stool too long ( about 40 mins ) as I was stucked in traffic on the high way. It made me feeling very ill. My face tured pale and I felt like that I was going to faint. I went to a toilet straight away as soon as I got home and fell asleep for 3 hours right away. Just wondering if it does effects the baby ?? Will it cause problems to the baby ??