I would not worry about it,you know why,because if you are that worried about it,and that afraid that you did it,and so afraid of doing it,you did not blaspheme against God.
The thing is you looked up blasphemy against the Spirit,then you wondered if you did it,so you did not know for sure that you did it,and then after that you had bad thoughts about it.
But it seems like you are so afraid of committing blasphemy against the Holy Spirit that you wonder if you did it,or believe you did it,but I do not believe you blasphemed the Spirit,but you are so afraid of blaspheming the Spirit,which makes you keep your mind on it until you somewhat confuse yourself,and it is really a feeling that you are afraid of blaspheming and not actually blaspheming.
It is like a side effect of a anti depressant drug that it might give you thoughts of suicide,but the side effect cannot actually give you a side effect of thoughts,for it can't put words in your mind,but it gives you the feeling and the thoughts accompany that.
The thing is it is a feeling of worrying about it,because you are so afraid to think that,and not actually doing it.
If we are so afraid of thinking something because it bothers us,and worry about it,our mind will stay on that and the feeling will become more intense in worry and fear,which because of the intense feeling we then think we are thinking something wrong.
That is why the bad thoughts came later,because when you first thought did I blaspheme the Spirit,the feeling is low,not too much stress on the mind,but if you worry about it and are afraid that you might have done it,over a period of time the feeling becomes intense,because of stress,then because of that increased intense feeling because you stressed your mind somewhat,you think you did blaspheme because of the feeling of anxiety,not because you actually did it.
Or so it seems.
My friend loved the Lord,and never said anything against God,and was never mad at God,and only said good things about God,but he thought that he blasphemed the Spirit,and I told him you are so afraid of blaspheming against the Spirit that you think you might have blasphemed against the Spirit.
Another friend had a daughter that was about 3 years old,and he told me he had a thought of having sex with her when she was an adult that bothered him,and I told him you are so worried of ever having a thought like that,that you think you had a thought like that because you are worried about it.
It seems like if we are so afraid of having a certain thought,that would bother us,that thought will come up because we are worried about ever having a thought like that.
God said overcome evil with good,and if you keep worrying am I doing wrong,am I doing wrong,you might think you did wrong,but if you go about keeping your mind on goodness and go about doing good,you keep your mind positive and don't worry about did I do wrong,which if you worry about it can make you think you did wrong,at least thought wise.
But we also know we will be tempted,and we can't let temptations get us down,which my pastor said he almost let temptations beat him down,which must mean it must have bothered him to have temptations,thinking he can overcome thinking anything like that,but we will be tempted.
That is the case with some people that worried that they blasphemed,which I believe they really did not blaspheme,which seems like your case.
Blaspheming against God is calling God evil when God is good,like saying God is punishing me,or God does not care about me,or does not care about people,or Christianity is evil,which that is what the beast does is blaspheme against God by saying the Christian religion is evil and God is not real.