Hello, I have gone through the query and understood your concern. Ovulation occurs two weeks prior to the onset of the next menstrual period and if you have regular monthly cycles, you had the sexual act during the ovulation period or fertile period. The cause of this light bleeding can be either an implantation bleed or due to the stress you have had in the last month due to constant moving. To clarify, please go for the assessment of the serum beta-hCG titres and follow it up with a trans-vaginal sonogram. Further management can be planned accordingly. Hope this helps.