Terrible tummy ache and constipation :(

Gabriela • First time mom. 23. Due 06.26.17
Since last night I have a terrible tummy ache, I was able to use the bathroom but it continued. This morning I still have the tummy ache. I feel so nauseus and like I have to use the bathroom, but I'm constipated because of stupid Prenatal vitamins. I swear this 10 week has been the worst. 
I'm going to have to take prenatales without iron. I was so regular, before I started.
I just took Diclegis to help with the nausea, because I've had it since last night. Will that make the constipation worse? 
Thanks!