What do you think? possibility of being pregnant?

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Ok so my gf has been on the pill for 4 months nowand for the last 2.5 months we have been using condoms about half the time when we have sexI know that research has shown that anti-biotics (other than a few very harsh ones) have very little to no effect on the pillhowever my gf took 3 days of anti biotics during her last period (and pill break week) to clear up a urinary tract infectionanyway, she is now about 3 days late, we did a pregnancy test last night (one of the up to 4 days before missed period ones) and it came up negative (not pregnant) but we are both still a little concernedany thoughts on this?if she hasnt started bleeding by thurs we are going to do another test as recomended on the test instructions

Three days late isn't very late. Stress can easily make it a week late or more.

Ineligible was right. When I first started having sex it was twice the creepiness because the gf could sometimes completely skip a period.. Talk about biting your nails.Just take another pregnancy test in another few days per instructions. Sounds good so far really.

Most stress women are delayed in their monthly period.And it's normal, but since you have contact with your gf. You worried because she had antibiotics right?Try to repeat the test after a week and if she is pregnantinform your doctor about the antibiotic. But even pregnantwomen need medications for UTI. Good luck!

It may be an idea to do the pregnancy test first thing in the morning as it is the most accurate time to test urine, however if in any doubt there are other pregnancy tests offered by your local gp hope this helps