Hallow Dear,
I do appreciate your apprehension.
In fact insertion of tip of penis (
glans) inside the vagina is sufficient to cause
pregnancy - even before the ejaculation. Before ejaculation, possibility of deposition of preejaculation secretions (precum) is always there. This gets deposited unknowingly and the person is not aware that he has ejaculated precum. Precum contains some sperms which are capable of causing pregnancy.
However, in your case, since within two days after intercourse, you have got your menses, there is no possibility of pregnancy for two reasons.:
1. The egg release is 14 days before the menses; while you had intercourse two days before the sex. Hence there was no egg present to get fertilized.
2. You have got the menses 2 days after the sex proving that you are not pregnant.
So dear, please remove the concern of pregnancy from your mind and enjoy your life. To avoid such stressful situations in future I would advise you to use reliable
contraception method like birth control pills, condom or
intrauterine device.
I hope this helps you.
Dr. Nishikant Shrotri