I would keep an eye to make sure that there is no pattern to the pain - if there's a pattern, I would go to l&d. If you want to avoid the hospital but want medical advice, I would suggest calling your doctor's office since they should have someone on call that you could be patched through to, or for whom you can leave a message and have a call back.
Round ligament pain, and the bby laying on nerves probably. If theres no leakage or bleeding u should b fine until u can call ur dr.