Pregnancy confirmation. Be pregnant?

I should get my periods on July 27 or 28th. But I missed my periods. I had an unprotected intimation when I was near to my periods time. But we were conscious about the orgasm. He took it way when he was about to get orgasm(we were conscious about it). Since then Im getting cramps like periods but there is no sign of periods. I'm having juices in which vitamin c content is high like muskmelon and also drinking tumeric water everyday(for about 5 days). I also took pregnancy test on August 1st in the evening and also on August 3rd(early morning urine) both resulted negative. My urine is clear so far. No white discharge. Last month issue: The thing is last month I had lot of non veg food with lot of masala of which I had indigestion problem, gas problem, indigestion vomits, motions. Even yesterday I had this same issue. My upper stomach is a bit swollen. I'm in lot of confusion now. Is there a possibility that I will be pregnant?