Contraceptive pill and risk of pregnancy - am i being paranoid?

I have been on the pill for three months now and on monday, my pill-free week starts and my period is due. Last time i worried non-stop about being pregnant, even though I also use condoms EVERY time without fail. I take my pill every day within 15 minutes of 08:30 and have never missed a single one. It turned out to be nothing, but i have had 'blood spotting' for the past few days and am really worried it's a sign of pregnancy? I have been taking antibiotics for a chest infection for four days and the symptoms started as soon as i took the medicine, apparently antibiotics make the pill less effective - my boyfriend and I had sex with a condom two days before i started the course of antibiotics, and not since. Is this spotting to do with the medicine, or is it more sinister? Is there any way i could be pregnant, or am i just being stupid and paranoid? Has anyone else had similar symptoms on the Pill or with antibiotics? I'm just panicking as usual.....thanks:)

For the most part you're fine. If you haven't had intercourse since two days before you started the medicine then thats fine. I would not recommend having sex while taking the antibiotics because yes, like you said, it can sometimes lower the effectiveness of the pill. The spotting can occur because you're still new to the pill ( i had spotting for 4 months into it) or it could also be the antibiotics. But it seems like you take it everyday on time and are really careful using double protection so you're good. Just try to relax now!

There is another way of you getting pregnant.
Although if the men penis doesn't enter the women's private, you can still get pregnant