On Birth control but missed my period

[Talita007]

I am on Yasmin and I never skip my Pill. My husband and I had unprotected sex on the 20th and 21st of March.  On the 21st of March I drank my Yasmin later than usual. I was looking at the Ovulation Chart and my Ovulation took place on the 22nd of March.

My period had to start 4 days ago but nothing happened. I took a pregnancy test (twice) and it was negative!  Can it be possible for me to be pregnant?

Secondly, I did see a change in my menstruation last month. Instead of having 5 day of bleeding, I had 3 days of bleeding but it was less than usual.  

Thirdly, I had some kind of yeast infection about 2 weeks ago. I was on antibiotics this week. Could that also influence something?

[loismwallace]

I too am having a pill baby....lol (Ortho Tri-cyclin).......never missed one. All I did was switch from taking them in morning to night.

Anitbiotics definately can screw up your BC. If you think your period was odd last month, I would go ahead and test. I had what I thought was a period in Oct 07 and it wasn't (implantation bleeding). I found out Nov 07 that I was pregnant when I missed that months pregnant. I was already 9-10 wks preggo and didn't even know it.

[chitten]

I fell pregnant on the pill (marvelon) and i never missed a pill.

My doc said that antibiotics can interefere with BC and make it less reliable so yes you could be pregnant.