Nausea for 2 days, intentionally skipped period on bcp, ligh

I have been on the birth control pill Yasmin for a little over a year. Last month, for the first time, I decided to skip my period (ie, start a new pack immediately after the first one finished). On the last 2 days of the old pack, I started to have some brown discharge, light at first, which eventually got a little heavier as the weeks progressed. I started to have protected (with a condom) sex with a new partner on the first day of the new pack and we continued having sex for about 1 1/2 weeks. After 2 weeks of the new pack, I decided to induce a period since I was getting fed up of the spotting and thought it could be due to the skipped period. I stopped the pack on a Saturday and got my period on the Wednesday. It was a fairly normal flow for one day with red blood, less flow the following day and then a brown discharge for the rest of the days up to about the Saturday. I started another pack of pills on Sunday gone, but have been feeling nauseous and gassy since the Saturday. It's now Monday and thought the nausea has subsided a little bit, I still feel a bit queasy. It's been roughly two weeks since I last had sex.

I take my BCP religiously and at the same time everyday and have never had sex without a condom on. I took a home pregnancy test on Sunday and the results were negative.

I am also a vegetarian and have suffered from nausea/gas attacks before due to improper dieting.

My ultimate question is then...what are the odds that I'm pregnant? The only thing that bothers me is my light period and the persistent spotting (which has stopped now) but I know this could well be related to that skipped period a few weeks back.