It sounds like your round ligaments stretching out. I'm 20&3 today, and sometimes if I do clean a lot I will get those pains you're talking about, and when I relax, drink some water it goes away.
Sounds like stretching to me. Rest and try to keep your feet up. Drink plenty of water. Round ligament pain is probably what it is, but you can talk to your doctor or midwife about it.
It doesn't sound like it. But if you start bleeding and cramping I would call your doctor in the morning. Go lay down and prop your feet up :)
My moto is if it doesn't feel right consult a doctor :) bbbbbuuuutttt for me right now being exactly 17 weeks pregnant as well.... I get a lot of the pain too and my doc says its round ligament pain. Google it you will find better I do than I can give. Also your uterus at this moment in pregnancy is about an inch to two inches under your belly button and the pain you are feeling is too low. Your rpu d ligaments originate at you uterus and attach onto hour pubic bone causing pain in the vagina area if you over work it or stretch it to quickly. Hope that helps :)
I believe it may just be your body stretching or your uterus growing :) if you are worried maybe you should call your dr