Should I have called my doctor?

Last night, I was watching TV and being 28 weeks pregnant, had to interrupt the TV to take a pee break. Everything went normal except that when I wiped the toilet paper was tinged pink. About 30 minutes later, I began having these little cramps (felt worse than Braxton Hicks) that never amounted to anything. Now, the pink discharge never came back and the cramps are almost completely gone this morning. My question is whether I should still call my doctor to let them know know what happened last night.