Pregnancy or some other thing?

I had intercourse unprotected, 5 months back (had ipill, upt negative). Then again 2 months back (had ipill, upt negative). After that had meprate 1BDx5 for periods last month (as i have pcos, didn't had natural periods since past 8 or 9 months). Now having nausea from past 1 week so did upt again which was negative.  I'm having increased discharge as well from vagina (white and sticky). Even having pantoprozole gives only 1 or 2 hours of relief to feeling of nausea and then again it's back. Nausea usually starts from morning till evening and and till night it goes away. 10 days back i had cold and cough and which is now alright but very little cough is still present. I am concerned about nauseated feeling. Why am i having that? Because of pregnancy? But upt was negative. And now heavy vaginal discharge..? I usually have consitpation complaint due to which i feel nauseous but right now isn't having constipation still feeling nausea.