Are these pms boobs or early pregnancy boobs?

pregnancy boobs?" />
I am experiencing tender boobs and I'm 22 days into my cycle. This started to happen around day 17, and I ovulated on day 15 judging from my CM and cervix position. My boobs only felt painful when I squeeze them, and it's mostly on the lower part of my boobs. No pain on upper parts. They feel like 2 stiff lumps. 
Cervix is currently low, firm and closed, CM is dry/ a little creamy/ stretchy (not more than 3 cm if stretched). I don't think I experienced PMS boobs so early in my cycle before, and I couldn't find proper explanation online when I searched for "PMS vs pregnancy boobs". Can you guys help me by sharing experiences and telling me whether what I'm experiencing is PMS or early pregnancy boobs? 
I'm sexually active but I did not have sex this cycle. I only gave a handjob on day 13 of my cycle and washed my hands with water before touching myself (outer labia), and I didn't push my fingers into my vagina. 
I know you'll be saying "you can't get pregnant without having sex", but I'm just afraid there's a tiny chance I might have artificially inseminated myself (freak accidents). Please help me! I'm only 17. 

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