blood off and on? has this happen to you?

Jane
Has anyone bleed off and one? The 1st time I had a sharp cramp and then bleed where it filled my Undies. Long story short everything was fine. A week later, yesterday same blood drops, then only when I wipe. None over night.. then none all day until now. Blood when I wipe. I'm 7 weeks. The 1st experience I went to ER and they found a heartbeat with 40k HCG levels.. I called my DR this am for this weeks episode.. they want me to come in Tuesday. Anyone exeperiance this and maybe it wasn't a MC? Trying to think positive as I see so much MC on here