Is it possible to miscarry and not really know for sure?

Here's what has happened, and I'm wondering if I possibly miscarried. My husband and I have been TTC baby #2 for 5 months. I'm very regular with my cycle, never late. If anything, I'm occasionally a day or two early. This month, I was a week late. I started testing on missed day #1 and then every other day after, and each test was negative. When my lovely period finally arrived, it was the heaviest, most miserable period I've ever had in my life. I had terrible cramps and didn't feel like getting out of bed the first day. I also passed several huge clots, which is not normal for me at all. It was awful. It's been over a week now since this happened, but the more I think on it, the more I wonder if I should have gone to the doctor? If I did go, and if that's what it was, was there anything they really could have done? Will this affect the fact that we are still TTC in any way? If not, I'd almost rather not know for sure. It's easier to think of an awful period than a heartbreaking miscarriage. I keep thinking, if that's what it was, all those negatives must have been Gods way of protecting my heart.