Pregnant with period

Ichigo • I have one daughter. I'm also pregnant with my second. Unmarried.
So I've heard that some people have gotten pregnant and still had their periods. I'm wondering if that's true. Because I think that's what's going on with me. Lemme explain. So for about 3 weeks now, I've had random sore boobs, and for three days my nipples are like really sensitive. This is not a pms symptom of mines. It's never happened to me. Also I can see the veins in my boobs. I'm not as nauseous as usual but my appetite increased even though I can't eat much. I'm always weak and tired. I felt sick, like I had the flu, but there was no rise in my temperature. I pee about 5-6 times a day when I used to pee once a day, I haven't increased my fluid consumption. My period came November 1; 25 or 26 days after my last period. That has never happened. This period is void of cramps. I'm very confused because usual once my period comes, I just have mood swings, but this is much more. Any ideas of what may be going on.