TTC and prenatal vitamins

Dawn • I`m 29 years old. I`ve been married to my best friend for over 3 years and now we have are expecting baby #2 on the way due in September 2018 ❤️❤️
So I'm currently in my 6th month TTC. I started off strong taking prenatal vitamins everyday.  I feel like they gave me digestive issues and I took them for about 4 months and stopped. Has anyone else fell off the wagon with prenatals while TTC???