Spotting?

So we stopped birth control in December, which made my cycles shorter (usually around 24 days instead of 28). With that being said I started spotting Thursday which would mean my period would have started yesterday. I usually spot light and then it gets heavier and heavier until I get my period a couple days later. So I spotted like once on Thursday and then nothing on Friday. And then nothing on Saturday. Then Saturday evening we had sex. After we had sex I had enough bleeding that I thought my period had started. So I go back to the bathroom maybe an hour later and there is NOTHING. No blood not even a little pink tinge. So I took a test this morning. I can see a very very faint line. But I’m concerned for the bleeding that I had yesterday if I am pregnant. Is that normal to have spotting like that in early pregnancy? I don’t remember spotting at all with my first baby.