I have not yet had my period but I've been bloated the past 4 days and nauseated...today while having sex I bl?

have not yet had my period but I've been bloated the past 4 days and nauseated...today while having sex I bled a little and I bled afterwards a little throughout the day. Now it seems to have stopped completely after 6 hours. I did not bleed alot at all but some. My stomach been hurting too. The blood wasn't like it is when I am on my period either. What could this be? Could I be pregnant? I just do not see how I could because I am so careful and check the condoms after sex by filling them up with water to make sure there's no holes. The only way I could be is if some precum got on my husband's hands when putting on the condom. What do y'all think?