I have spotting, even when I'm only supposed to have my period in 2 weeks. Is this normal?

I switched to a different kind of pill, three months ago, but I was spotting anyway before I switched. I was on the contraceptive (28 days). I fall within my week every month, but two or three weeks later I get spotting. Now I am on a continuous pill, but I still fall in my week every month, because otherwise I would have spotting for a long time. When the spotting starts in the second or third week, I still take my pill at the same time every day. But in the fourth week, I stop it to get my period. I preferred to fall in my week every two or three months, but without spotting. I've been spotting for almost a year. That's why my doctor changed my pill, but it didn't work. Sometimes I have months where I don't have spotting, but it's very rare.

I wonder if there's a connection with my sex. When my boyfriend comes inside me, sometimes I get spotting the next day and it continues all week.

My old pill was Yasmine 28 and now it is Mirvala 21. I had told my doctor that I had spotting and she prescribed it. I don't take any other medication except for the one for my concentration. I have been taking concerta 72 mg for several years. I have been tested and I have no sexually transmitted diseases. My boyfriend has also been tested and we have no other partners. However, I haven't taken a pregnancy test because I'm so often in my week. I get my period almost every third week.

Should I take a pregnancy test?

Thank you