Think I may be expelling?

Started my period today (a couple days early, but it's been a very stressful week) and I have had much worse that usual cramps. I can't do anything but lay down with a heating pad, and this is after taking pain meds. I went to check my strings, and while they don't feel very long, I do feel a knub on my cervix that wasn't there before, and my cramps worsen when I touch it. Tried calling planned parenthood but they are closed today for the holiday. Is it okay to wait a few days before I get to Dr. for ultrasound? I would consider having my hubby (who is a paramedic) pull it out, but since we had sex yesterday I don't want to have zero protection against getting preggers (even though I know it's unlikely considering where i'm at in my cycle)...help ladies?? Even if it's expelling it does still provide some protection again pregnancy right?? Thank you!!