pregnant or confused

I had sex a few times unprotected (he didnt cum in me) I got my period like normal heavy and lasted its normal 5 days. I did not have sex after that for about a month. then june comes around and a week before my period I have 2 days od old blood spotting and then on the 3rd day I had a period and then the 4th day was brown spotting again only used a panty liner and barely anything on the panty liner the entire time. Now Im very emotional and extremely horny randomly which is unlike me. Idk whats going on with my body this has never happen before? is this a normal thing that can happen? I dont wanna buy a test because I got my period last month after having the sex.. im just confused?