Anyone else get this?

So my period was 5 days late, and I only had it for 2 days, the rest was like wiping and a small amount of blood. The two days I had my period It was very mucousy which normally doesn't happen to me.

Now I'm tired all the time, like I take naps all day I'm just so exhausted. All I wanna do it eat, and only sweets and I'm always having back pains and cramps.

Last test I took was 2 Fridays ago and it was negative.

Anyone else have this?

Should I be worried?