New to this. Pregnant or?

So guys for about 2 weeks I’ve been have serious bloating and I’ve been feeling nauseous. My boobs started hurting on the sides and underneath and they were kind of sensitive - after telling my friend about this she suggested that I might be pregnant so off I went to buy a pregnancy test. Kind of nervous about taking it I told my self that I’ll take it the next day .. and so it went.

I started googling things to kind of put my mind at ease but anyway ..

yesterday I got my periods which 1) means I’m not pregnant and 2) I saw some uterus lining and blood clots on my tissue paper so that means I’m definitely not pregnant.

Am I right to think I’m not pregnant or could I be?