Could i be pregnant?

So me and my bf had sex during my fertile week according to glow (but I didn't realise) we usually do the "pull out method" but this time he didn't and when I came onto glow I realised it was my fertile week... So now I'm thinking if there is a possibility of me conceiving? We spoke of ttc but haven't be "trying" just if it happens it will happen sort of thing... But since I realise there could be a chance it has been on my mind now and then and we had a still birth whilst I was 5 months along and gave birth to our babyboy officially 2yrs this month... So the thought of us possibly being pregnant is scary for me in particular based on having that experience... Any advice ladies?