Low pelvic discomfort

Lee • Married to my wonderful husband and expecting our first child in August 😍👫👶
I'm 16w3d & I've been having low pelvic pain sort of... More annoying than painful.. Kinda feels like a very mild menstural cramp that won't go away.. Can't get comfortable at night.. 
I thought the 2nd trimester was supposed to get better??... 
Anyway went to Dr today.. She really looked at my cervix & it looked perfect. She said the baby has gotten BIG since my last visit 4 weeks ago & his/her head is resting directly on my cervix... She's not sure if that could be the cause of the discomfort but will see me back in 2 weeks to check me again...  
This is so unpleasant.. This is my first pregnancy.. Just wondering when things will be peaches & cream like I've been hearing...