Painful sex?

Erica • Newly married to the love of my life and just had our little boy March 10,2015. 💙
I'll be 15 weeks tomorrow, my husband and I tried to have sex this morning (we haven't had sex since very early pregnancy ) i just haven't been in the mood till this morning and it was so painful it wouldn't even go in. Has anyone else had this happen, and what did you do for it?