If it was only this past weekend that you and your boyfriend had unprotected sex, it is unfortunately too early to tell whether you may be pregnant or not. You generally need to wait until your period is due, or 2 weeks from the time you ovulated (when the egg was released). A simple pregnancy test from the chemist will confirm it for you at this time.
For you to have fallen pregnant, it would mean that you ovulated quite soon after coming off the pill. (The average female is only fertile for about 5 days out of every month - that is, the 3-4 days leading up to ovulation, and the 24 hours surrounding ovulation itself). Given your age, it is likely that your fertile period is slightly longer than this (ie 7 days). Some women encounter some blood or blood-tinged mucous around the time implantation occurs (when the fertilised egg implants into the wall of the womb). If the cramping continues without any sign of a period then it could be quite probable that you are pregnant - but I don't want to alarm you.
If it turns out that you are not pregnant, I strongly suggest you read into the signs of fertility (non-fertile and fertile mucous, and temperature), so that you are better able to monitor where you are in your own cycle, and this way you will have control over when it is safe or unsafe to engage in sexual activity. That way, if you are off the pill (which I strongly advise given the breast lump that you found) you can simply use an alternate form of contraception (ie- condoms) during your fertile period - or simply avoid intercourse on those days.
Taking the pill whilst pregnant can harm the baby so its best you avoid that until you are sure. You can use alternative contraception in the meantime.
I hope you are ok no matter what the result. Remember, there is plenty of support in here and no one will judge you. Let us know how you go.
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