I had sex with an old friend on November 28th using a spermicide (vaginal suppository). He did pull out before orgasm. I had my expected period on December 5th but it was shorter and lighter than my normal periods. My boyfriend and I got back together and had sex on December 10th, 16th, and 18th. On January 4th I took a home pregnancy test (urine) and it was positive. Same day HCG was 292. I had an ultrasound that day because of severe cramping and some spotting at which point the ultrasound tech was unable to see anything (no sac). A week later I had an ultrasound where the sac was visible. A week after that the yolk sac was seen and the heartbeat was seen with a transvaginal ultrasound. 10 weeks after my period the baby's crown to rump length measured 3.58 centimeters. My HUGE question is: is this my boyfriend's baby or my friends baby. Could that smaller lighter period have been something else? Could I have gotten pregnant with this baby on or around NOvember 28th? Help:(
Welcome to ehealthforum.
If you had used spermicide (and there was no ejaculation) in your prior intercourse, and if you have had your periods in between two sexual encounters, chances of the one after periods resulting in pregnancy is higher. If you know your LMP (last menstrual period dates), and your current gestational age, count backwards from current gestational age to see if you arrive at your conception date after your LMP or before your LMP. If your due date (completion of 40 weeks of gestation) is known, you can again count back to arrive at your conception date after your LMP or before your LMP. If your periods are regular, and if you take your LMP as Dec 5th, 2011, then your probable conception date would lie between Dec 15th - Dec 24th, 2011, with ovulation occurring around Dec 19th, 2011 (calculation based on menstrual cycle length of 28-30 days). The intercourse closer to your ovulation time would result in pregnancy (after ovulation, egg is alive for next 24-48 hours to be fertilized). You can also request your gynecologist for assistance with getting a dating scan done to look at your probable conception date. The exact results can only be made out after a Paternity test. Visit your doctor/gynecologist for further assistance and clarification.
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