Having ‘periods’ but could I still be pregnant?

In the last few weeks of Might I had unprotected sex multiple times with my boyfriend. I was on the pill and took it correctly, never missing any, although I had sickness and an upset stomach for a few days. A couple of months have passed since then and I have had two pill-break bleeds and am currently on a third but the flow seems to be getting lighter (my periods are usually very heavy even on the pill) and there are no clots in it. I’m experiencing symptoms such as frequent urination, hard/bloated stomach, craving sweet foods, unusual discharge and mood swings. I purchased a cheap home pregnancy test from eBay but it came up negative. Could it be wrong? Is there a possibility that I could be pregnant?

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Answer:
there's always a possiblility, some baby's just fight there way in there no matter what! go to ur doctor to find out for sure!

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Answer:
Very unlikely but go to the docs and get a blood test. It sounds more like your pill breaks and pill arent agreeing with you.

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Answer:
Im pretty sure i just answered yor other question….

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Answer:
Just buy a reliable kit and then you’ll know. But yes there’s always a chance.