You came off the pill Sunday? As in 5 days ago? Honestly I doubt you're pregnant already unless you fell pregnant on the pill. If you were getting such symptoms, I'd expect a positive pregnancy test. It could be a false negative due to it being too early but honestly I doubt you've even ovulated yet! I think it's probably just stopping the pill to be honest. I would wait for another couple of weeks before you test. I'd expect your period to be due at least 4 weeks after coming off the pill.
I am just looking for some advice, I came off the pill last Sunday as me and my partner are trying for our second child. Since Wednesday I have been having stomach cramps (mild) backache, nausea, feeling tired and slightly sore breasts. I have always had irregular periods but I fell with my daughter within a week of coming off my pill. I went to the docs this morning and he took a urine sample to test for pregnancy or an infection and both were negative, he put it down to maybe the start of a period. I never normally feel like this and didn't feel like this last time I come off the pill. Could the test be wrong as it was done so early? When would I test again as I never know when my period is due?