Period questions

So I've been waiting for my period since I might be pregnant and I'm a couple days late , I got some bleeding this morning but normally my period is pretty heavy the first two days and I haven't bled that much today (I'm using a pad so I can keep track of it) I think it's too much blood to be considered spotting though. Plus it's a really dark color like how it is normally at the end of my period. I'm having back pains and a little bit of cramps but that's it. Any advice?