I'm just going to lay out my entire situation and I'd be really appreciative of any feedback.

However, recently, my periods have been quite regular (every month - although I'm not entirely sure how many days apart). Therefore, the fact that I have not had a period for this amount of time is worrying. 

I am sexually active, and I think the main cause for concern here is that I have been very sloppy with contraception.... My boyfriend and I use the withdrawal method primarily.... Which I am fucking cursing myself for using ... He's very good at pulling out on time, and as far as I'm aware we haven't slipped up on that front... Also, he pulls out when he is about to pre-cum.... I haven't actually found anybody talking about doing this, so now I'm questioning it.... My boyfriend claims he can feel when it's about to happen. 

I took two pregnancy tests last week and they were both negative.... But I've been googling and it's just made me so worried with so many women saying they got false negatives and then bloody false blood results and then they were 7 months pregnant blah blah.... :(((( 

Also, I'm just so so scared because if I am pregnant I'll have to have an abortion - no other option. I've read that the medical abortion is extremely painful... So many horror story's.... And I can't bear the thought of being put under anesthesia for a surgical abortion, and getting a bloody injection into my cervix... Well, no thank you. I'm extremely terrified it's currently 5:21am and this is the second time I've been up worrying this week. 

I guess my period could be late due to stress.... I had a pretty big argument with my boyfriend last week which was just awful, I have A-level exams and things....

So....

1) is this pulling out when your about to pre-cum thing an actual thing that could prevent pregancy or bull? 

2) please please could someone just give me some advice/reassurance I'm going out of my mind, thank you in advance!