Hi I'm Ttc, Had Sex Frequently Around Ovulation. Pink Spotting

Hi I'm ttc, had sex frequently around ovulation. Pink spotting appeared for 2 days on day 26 then got heavier for 1 daythen light bleeding (red) for 2 days. I'm not nauseous,but I do have fluttering in lower abdomen,had heartburn one day, not sore breasts but they do seem fuller.im gaining weight. I did have severe cramps but only on the day of most bleeding (day3). I'm not sure if that was my period?seemed different to usual 3 day regular flow. Can u help? Thanks