I had the same EXACT thing happen when I was 14 weeks. I remembered my mom telling me she got hemroids when she was pregnant but that they hurt extremely bad, well, mine didn't. I called my on call Midwife and she said sometimes when they are internal they don't hurt at all. She told me to obviously drink as much water as possible but she told me to start taking a Probiotic, which would help my digestive system as well as LO's. I have been taking the Probiotic's from that day on and I haven't had one more problem.
This is the Probiotic my Midwife suggested: