Regulating or Pregnant

Hi all, I'm new to this but thought I'd give it a try, I have an ectopic pregnancy surgically removed on 11.8.15 along with my left tube, I had my first period 56 days later currently on 43 days prior to this I had sort of got my periods regular at 35 days. I feel things are happening I have (excuse to much info) the gung approx 2 weeks ago and me and my husband have been active, I have done home pregnancy test last weekend and it showed negative. Anyone got any thoughts, could I still be regulating or pregnant? Feel crappy and moody in myself, tired, migraines and teary this could just be my time of month brewing or pregnant?????