Pregnant?

I usually have a very regular period but as I type this, I am 15 days late for mine. Not actively using birth control, had sex a month ago on my honeymoon and he finished inside. Took a plan b after and I was fresh off my last period at that time.

I took a pregnancy test on my 7th and 10th day of being late and the first one was negative but the second one I saw a possible faint line. How long should I wait before I take another test?

We were having sex again last night but my cervix was really tender. The pain caused me to stop, not sure if that makes a difference. I did spot brown for two days in the middle of my cycle though.

Anyone have insight or suggestions? I can't see a doctor for another month.

Update: tested again... came out negative