Am I pregnant ?

I had sex (no protection & he came in me) literally the day before I got my bc taken out (on June 28th) and I was only on it since January (6 months) and since then I’ve been having back pain, body pain headaches nausea and last wednesday my boobs were really sensitive and hurting and now I’m lactating but it’s only a little and on July 4th I went on vacation and I thought I was getting my period because my stomach was hurting really bad one day and it was only a small amount of light blood and I checked like an hour later and there was nothing and hasn’t been anything since and lately I’ve been really bloated and nauseous and tired a lot and my mood swings are bad.