Hallow Dear,
Your period is due in a day or two. So instead of getting tense, just wait expectantly to see whether you get your menses.
You had your intercourse on day 18 of your cycle which falls in your fertile period considering your cycle of 30 days. Though you had protected sex with condom on, immediately after removing the condom, he had inserted his penis inside your vagina. The penis was soiled with semen inside the condom; hence it was definitely not safe to avoid
pregnancy. Even a period of 5 seconds is sufficient for some semen to enter the vagina and cause pregnancy.
Now, you have following options to assess the situation:
1. If you get the menses within a couple of days (or may be later), you are not pregnant.
2. If your menses are delayed by a week, you may get pregnancy test performed on your overnight morning first urine sample; earlier the test may report false negative.
3. Alternatively, you may opt for
Beta hCG test on your blood 10 days after the sexual incidence.
I hope this helps you.
Dr. Nishikant Shrotri