It is more than likely not a problem and I would expect your placenta to have moved higher. However one persons idea of spotting can be a lot diferent than anothers. If you are having to change your pad more often than you normally would I think you should get it checked before tuesday. If you are still bleeding at the same amount tomorrow then I would go and get checked tomorrow. If the bleeding increases then go to hospital. If your bleeding is only the occasional spot and it stops overnight then it would be ok to wait until tuesday