Brown Discharge Confusion

Hi,

i've been taking the pill for about 4 months but have been on off the pill for years. My b/f has had a vasectomy a few years ago and my only real reason for going back on the pill was because I was going away and didn't want to come on whilst abroad. When I begun taking my second packet I had subconsiously switched back to a previous brand I used to use and although I have taken all my tablets on time etc, about 7 days into my new pack I begun getting spotting and then dark brown lumpy discharge. I have never suffered this before so have been very alarmed. Furthermore I am suffering from tender breasts and stomach ache, symptom associated with both period pains and pregnancy. I last slept with my b/f about three weeks ago but surely pregnancy isn't possible? We have both been tested for std's/sti's but this was a while ago.

I finish my pack in 10 days and hope a fake period will arrive but if anyone has any info that may help me, it would be greatly apprieciated! I would visit my doctor however they are currently going into retirement and I have yet to be given a new doctor.

Mm