Hi and welcome to HCM!
Thanks for posting your query here.
In case of irregular periods
it is difficult to confirm about the conception because the exact ovulation cannot be predicted. Absence periods are called amenorrhea. This could be anovulation where there is no release of ovum from the ovary. This is influenced by hormones like oestrogen, progesterone
, pituitary hormones like LH and FSH, and thyroid hormones. Protective sex is by using barrier methods
or by using contraceptive
methods is not mentioned. If it is by barrier method like condom- rupture of condom at any point should be checked. If it is by contraceptive method the timing and usage of the pill matters.
In a normal 28-30day cycle, the ovulation occurs around 14-16day. If conception occurs at this period there are chances of implantation
from 14days of ovulation. For example if the ovulation day is on 14th march, on 28th day implantation may occur. Not in all cases we can see the implantation bleeding. The diagnosis can be made on urine pregnancy test. Please check urine for any positive pregnancy. If this ruled out it the spotting could be because of the irregular periods or withdrawal bleeding.
Hope this helps to you