Welcome to HCM. There are chances of conception if you had unprotected intercourse
. It seems you have irregular menstrual cycles. You should take pills or use barrier methods
if you do want want pregnancy
Get a urine test done for HCG, you can also do it yourself using the early morning, mid stream urine sample. Confirm if you are pregnant so that you can see your gynae at the earliest.
If you are not pregnant, get examined clinically for the spotting, get hormonal
therapy done for your irregular periods
. Irregular periods lead to mis-calculation of the dates and hence unwanted pregnancies.
Don't worry, eat well. You will be fine soon. Take care.