5 weeks pregnant, bleeding TMI

Lauren
Well doctors confirmed my pregnancy on monday, said i was 5 weeks. So this coming Monday i should be 6 weeks. Around 1pm I started spotting. And since 6pm i have been bleeding. I called the doc and they said to test and take it easy and if it the cramps get really bad then i am most likely going to miscarry. Anybody had anything similar and kept the baby? I have a 2 year old and this never happened with my first.