Hmm better go to your gynae fast....normally 3rd trimester to have blood traces is not a good sign.....and esp cramp like feeling
That day when my son was born, I also had like cramping feeling followed by a lot of blood, so.....went to Kandang Kerbau Hospital fast and thank God it was fast cos' my placenta seperated from baby oredi....so have to undergo emergency c-section
You better go check with your gynae to have peace of mind......
If you dont want to c your gynae, then mayb you might want to monitor your own body....within these 1 or 2days