was I pregnant?

So, a couple days ago I noticed I was gaining a little weight. Not a lot, but some. I felt a lump about the size of an apple in my lower left abdomen. Tonight, i went to the bathroom and felt something weird and big coming out. It landed in the toilet and was about as big as an apple seed, along with copious amounts of blood. The last time i had sex was jan 28th, did i just miscarriage?