Hi My Period Is Very Irregular , I Had It

Hi my period is very irregular , I had it last maybe October /November , I had unprotected sex about 4 weeks ago but my partner never ejaculated , I haven't had any symptoms but I experienced mild pinkish brown bleeding for a week it was very lumpy and it had a foul smell to it , I took a pregnancy test last Saturday but I accident dropped it into the toilet when I looked at it today it had two lines on it