Ovulation symptoms?

Averi
Hi ladies,
I think I'm going crazy here. I'm currently 13 weeks pp, and had my period two weeks ago. I would think now would be around the time that I would be ovulating, but I'm not charting, so I really don't know for sure. Anyway, for the past few days, I have been really nauseous, tired, had sore breasts, and just feel off.
Could these just be symptoms of ovulation? I've never really noticed symptoms during ovulation before. I'm not on birth control, so I wonder if I'm just being paranoid, and my mind is playing tricks on me. It's impossible or highly unlikely to get pregnant immediately after your period, right??