If your doctor has adviced for bed rest then you should follow all her advices, because spotting in first trimester is not a good sign.. Most of the women face this spotting issue and doctor consultation is necessary. If doctor advices for bed rest that means there are changes of miscarriage or any other complications and to avoid that you need to have good rest. Probably from second trimester situation will improve. dont worry. Tension will increase the problem. better relax eat healthy, stay happy. Everything will be alright.