Long period time frames

I want to have a baby but have put on a fair bit of weight over the past two years. Last year I saw the gynea and she said I need to lose weight if I want to have a baby. I've not but besides that, my period started about the 13th May and finished round the beginning of June, having said that I also hadn't had it in about 4 months. Thought is was pregnant but did many tests and turns out I wasn't. Had intwrcourae on the 8th June and according to a few ovulation calendars it says I could be. I've been feeling nauseous after eating every now and then, mainly when I eat brocolli. Without doing a test just yet and getting my hopes up... Is there anyone who has anything worth discussing on this?