Yesterday I started bleeding extremely light brown blood and it only lasted for about 10 min if that. It finally went away and I thought it was strange but I figured I was OK. Now today it started again this evening and was the same and lasted for only a couple min.
I'm having bad stomach pains and my muscle's in my stomach are hurting really bad.
I don't know what this is but am very curious. Me and my boyfriend have been together almost 5 years and I've never been able to get pregnant so I'm wondering if it's a sign of early pregnancy. I've never had this happen before. My periods are irregular but I'm used to that I've already went to the doctor and they've said nothing is wrong with me. But it's always heavy and red. Can someone please help me with this one.:o

Have you had recent intercourse? Sometimes spotting or light bleeding will result from that. Some women will have some brownish discharge soon before a period is about to start.
If you are trying to get pregnant, have both of you had some testing done since you have been together for five years?

I've went to get checked up and they've said nothing is wrong with me and I know for a fact he is very fertile... he has 8 kids. We have intercourse very often but I've never had this happen before.

I'm also not due for my perioud until the end of this month

You had all of the blood work done? Have they suggested anything to help regulate your cycles? They should check him, even after 8 children, as some couples will experience secondary infertility... where they have difficulty getting pregnant after already having had children before. There are also potential issues with how your body reacts with his sperm that could be looked into if it hasn't been already. After five years, you may want to consider seeing a reproductive endocrinologist unless that is who you already saw.
It's possible it could be from pregnancy, could also be hormone shifts that can cause some bleeding midcycle. See what happens when your period is due and test if need be. Good luck!