Pregnancy or Weight trouble

Yesterday my girlfriend was complaining about her back and feet hurting. Today she was in the tub soaking so that the pain might go away. Tuesday she had done some lifting, but not heavy things. But I know back and foot pain are also symptoms of pregnancy, but not exactly sure when they come on. We both are obese, but its been 2 weeks now since we had sex. I didn't come inside her..but I know that a woman can possibly become pregnant by pre-cum or if the guy didn't fully clean his penis after ejaculation. The thing is that..the time we had sex was a week after her period. I'm watching closely for the next several weeks to see that her period is on time. I asked her if she's tested to see if she was pregnant..but she says theres no reason for that. She's trying to ignore it..i'm trying to make sure..ya know. She has 2 kids already and I have none. Neither of us need this right now. Especially me!!!!! Someone give me some insight..cuz this is irkin me for real!

Hi. Sore feet and sore back are only a sign of later pregnancy when the baby is adding more weight and putting pressure on the back.
I wouldn't count that as a sign, but you know you are playing with fire if you aren't using condoms and she isn't on birth control.