Pressure on my cervix !?

Briana • 7.19.16💙4.17.18💙3.21.21🤰🏼23 Years Old ❤️
I am 15 weeks pregnant & have pressure on my cervix I'm scared something is wrong.. But part of my believes it's due from constipation and walls in my you know where swelling bc I haven't taken a poop lately ... Advice ?